期刊文献+
共找到75,833篇文章
< 1 2 250 >
每页显示 20 50 100
Two-thousand years of debates and practices of Yellow River training strategies 预览
1
作者 Zhaoyin Wang Cheng Liu 《国际泥沙研究:英文版》 SCIE 2019年第1期73-83,共11页
Throughout the history of China,the Yellow River has been associated with flood disasters and changes in the course of its lower reaches because of sedimentation.From 602 B.C.to 1949 the river experienced 1593 levee b... Throughout the history of China,the Yellow River has been associated with flood disasters and changes in the course of its lower reaches because of sedimentation.From 602 B.C.to 1949 the river experienced 1593 levee bursts,flooding vast areas,and claiming millions of human lives.The river shifted its main course by avulsion 26 times with the apex around Zhengzhou,resulting in devastating calamities and numerous old channels.Training of the Yellow River has a history of more than 3000 yr.Levee construction has been the major strategy for flood control.Two extremely different strategies has been proposed and practiced in the past 2000 yr,i.e.the“wide river and depositing sediment”strategy and the“narrow river and scouring sediment”strategy.This paper analyzes the levee breaches and flood disasters in the past 2000 yr and compares the results of the two extremely different strategies.The“narrow river and scouring sediment”strategy has only short term effects on levee breach control and flood mitigation.The“wide river and depositing sediment”strategy can essentially mitigate flood disasters and reduce levee breaches for a long term period of time.The“wide river and depositing sediment”strategy has been used and no levee breach has occurred in the past 67 yr,which has been the only periods of more than 50 yr with no levee breaches in the history of the Yellow River since 700 A.D.Modern flood and sedimentation management methods have also been introduced,and the strategy of applying the“widen the river and enhance the levees”approach for the upper and lower reaches management is proposed. 展开更多
关键词 Yellow RIVER LEVEE breaches AVULSION Wide RIVER and depositing SEDIMENT STRATEGY Narrow RIVER and SCOURING SEDIMENT STRATEGY
在线阅读 下载PDF
袁河流域河流生境质量评价及其影响因素分析 预览
2
作者 雷呈 黄琪 +4 位作者 倪才英 刘丽贞 罗津 刘建新 温巍 《江西师范大学学报:自然科学版》 CAS 北大核心 2019年第4期425-432,共8页
河流生境质量评价是河流综合健康评价的关键组成部分,也是河流评价管理的重要手段.选择涵盖袁河干流和支流的30个调查点进行河流生境质量调查和评价,采用了反映河道、河岸和滨岸带生境状况的10个指标,建立河流生境质量评价体系,进行河... 河流生境质量评价是河流综合健康评价的关键组成部分,也是河流评价管理的重要手段.选择涵盖袁河干流和支流的30个调查点进行河流生境质量调查和评价,采用了反映河道、河岸和滨岸带生境状况的10个指标,建立河流生境质量评价体系,进行河流生境质量评价和等级划分.进一步研究评价结果与河流水质、河流近岸土地利用状况以及底栖动物群落的相关性,以便验证河流生境指标体系对河流状态的的表征状况,探讨影响河流生境的关键因素.研究结果表明:(ⅰ)袁河河流生境质量指数综合得分介于32~81,全流域83.4%的调查点处于中等及以上水平,总体质量状况较好;(ⅱ)大型底栖动物种类数和多样性指数与河流生境质量关系密切,尤其是滨岸带生境;(ⅲ)袁河河流生境质量状况与200 m、500 m缓冲区内的林地显著正相关,与建筑用地显著负相关,且相关系数在空间尺度上存在差异;(ⅳ)袁河流域生境质量指数与CODMn显著负相关,影响河流生境的主要水质因素为有机污染物. 展开更多
关键词 河流 生境质量 大型底栖动物 土地利用 水质
在线阅读 下载PDF
ENERGIZING CAMBODIA'S ECONOMIC DEVELOPMENT 预览
3
作者 Zhao Yipu 《中国东盟报道》 2019年第2期52-55,共4页
The winding Mekong River flows from north to south into Cambodia. In Stung Treng Province in the northeastern region of the country, a hundreds-of-kilometers-long tributary is known locally as the Sesan River.“Stung ... The winding Mekong River flows from north to south into Cambodia. In Stung Treng Province in the northeastern region of the country, a hundreds-of-kilometers-long tributary is known locally as the Sesan River.“Stung Treng Province enjoys an advantageous geographical position, so if Cambodia can develop and utilize such good resources, the province will develop impressively,” declared our driver as our car crossed the Sesan River along Highway No. 7. 展开更多
关键词 MEKONG RIVER Cambodia Sesan RIVER
在线阅读 下载PDF
River Channel Improvement and River Ecological Restoration 预览
4
作者 YANG Yujing LI Zhiming 《景观研究:英文版》 2019年第4期102-104,107共4页
Recent years have seen the rapid development of China’s economy and urban construction. In this context, in order to meet the needs of people’s daily production and life for water resources, river channel improvemen... Recent years have seen the rapid development of China’s economy and urban construction. In this context, in order to meet the needs of people’s daily production and life for water resources, river channel improvement has become an important task. However, according to the analysis of objective factors, the way of human governance, which is contrary to the laws of nature, can lead to the destruction of river ecosystems. Based on this, this paper mainly discusses river ecological restoration around river channel improvement. 展开更多
关键词 RIVER CHANNEL IMPROVEMENT RIVER ECOLOGICAL RESTORATION EXPLORATION
在线阅读 下载PDF
Migration patterns and habitat use of the tapertail anchovy Coilia mystus in the Oujiang River Estuary and the Zhujiang River Estuary, China 预览
5
作者 Tao Jiang Hongbo Liu +1 位作者 Honghui Huang Jian Yang 《海洋学报:英文版》 SCIE CAS CSCD 2019年第8期35-40,共6页
Habitat use of the tapertail anchovy(Coilia mystus Linnaeus, 1758) from the Oujiang River Estuary and the Zhujiang(Pearl) River Estuary was studied by examining the environmental signatures of Sr and Ca in otoliths us... Habitat use of the tapertail anchovy(Coilia mystus Linnaeus, 1758) from the Oujiang River Estuary and the Zhujiang(Pearl) River Estuary was studied by examining the environmental signatures of Sr and Ca in otoliths using electron probe microanalysis. Individuals from the Oujiang River had higher and varied Sr:Ca ratios(expressed as(Sr:Ca)×1 000, 3.83–13.0 average) in the otolith core regions, suggesting that they were born in brackish or sea waters, and that a freshwater habitat might not be necessary for egg hatching and larval growth.While, individuals from the Zhujiang River had lower Sr:Ca ratios(0.39–2.51 average) in the core regions,suggesting a freshwater origin. After hatching, anchovies from the Zhujiang River migrate downstream to the river estuary close to brackish water. Our results demonstrated varied habitat use for spawning during stages of early life history between the two populations, and suggested that such variations are promoting diversity of life history strategies of this species. 展开更多
关键词 Coilia mystus Oujiang RIVER ESTUARY Zhujiang(Pearl) RIVER ESTUARY HABITAT use OTOLITH MICROCHEMISTRY
在线阅读 下载PDF
River bank protection from ship-induced waves and river flow 预览
6
作者 Sahameddin Mahmoudi Kurdistani Giuseppe R. Tomasicchio +1 位作者 Felice D'Alessandro Leila Hassanabadi 《水科学与水工程:英文版》 EI CAS CSCD 2019年第2期129-135,共7页
A new equation is proposed for the design of armor units on protected river banks under the combined action of ship-induced waves and river flow.Existing observed field and experimental data in the literature have bee... A new equation is proposed for the design of armor units on protected river banks under the combined action of ship-induced waves and river flow.Existing observed field and experimental data in the literature have been examined and a valuable database has been developed.Different conditions,including the river water depth,flow velocity,river bank slope,Froude number,wave height,wave period,and wave obliquity have been considered.Results from an empirical equation (Bhowmik,1978) that only considers the maximum wave height and river bank slope have been compared with the results calculated by the newly developed equation.Calculated results have also been verified against field data.Results show that not only the maximum wave height and river bank slope but also the water depth,flow velocity,wave length,wave obliquity,and wave period are important parameters for predicting the mean diameter of the armor units,highlighting the multivariate behavior of protecting the river bank in the presence of ship-induced waves and river flow velocity. 展开更多
关键词 RIVER bank protection Hydraulics Ship-induced WAVES RIVER flow velocity WAVE period WAVE OBLIQUITY Multivariate phenomenon
在线阅读 下载PDF
Hydrological Simulation Using TRMM and CHIRPS Precipitation Estimates in the Lower Lancang-Mekong River Basin 预览
7
作者 LUO Xian WU Wenqi +2 位作者 HE Daming LI Yungang JI Xuan 《中国地理科学:英文版》 SCIE CSCD 2019年第1期13-25,共13页
Satellite-based products with high spatial and temporal resolution provide useful precipitation information for data-sparse or ungauged large-scale watersheds. In the Lower Lancang-Mekong River Basin, rainfall station... Satellite-based products with high spatial and temporal resolution provide useful precipitation information for data-sparse or ungauged large-scale watersheds. In the Lower Lancang-Mekong River Basin, rainfall stations are sparse and unevenly distributed, and the transboundary characteristic makes the collection of precipitation data more difficult, which has restricted hydrological processes simulation. In this study, daily precipitation data from four datasets(gauge observations, inverse distance weighted(IDW) data, Tropical Rainfall Measuring Mission(TRMM) estimates, and Climate Hazards Group InfraRed Precipitation with Stations(CHIRPS) estimates), were applied to drive the Soil and Water Assessment Tool(SWAT) model, and then their capability for hydrological simulation in the Lower Lancang-Mekong River Basin were examined. TRMM and CHIRPS data showed good performances on precipitation estimation in the Lower Lancang-Mekong River Basin, with the better performance for TRMM product. The Nash-Sutcliffe efficiency(NSE) values of gauge, IDW, TRMM, and CHIRPS simulations during the calibration period were 0.87, 0.86, 0.95, and 0.93 for monthly flow, respectively, and those for daily flow were 0.75, 0.77, 0.86, and 0.84, respectively. TRMM and CHIRPS data were superior to rain gauge and IDW data for driving the hydrological model, and TRMM data produced the best simulation performance. Satellite-based precipitation estimates could be suitable data sources when simulating hydrological processes for large data-poor or ungauged watersheds, especially in international river basins for which precipitation observations are difficult to collect. CHIRPS data provide long precipitation time series from 1981 to near present and thus could be used as an alternative precipitation input for hydrological simulation, especially for the period without TRMM data. For satellite-based precipitation products, the differences in the occurrence frequencies and amounts of precipitation with different intensities would affect simulation re 展开更多
关键词 hydrological simulation satellite-based PRECIPITATION ESTIMATES spatial distribution of PRECIPITATION international RIVER the LOWER Lancang-Mekong RIVER Basin
在线阅读 下载PDF
Water Cooperation Priorities in the Lancang-Mekong River Basin Based on Cooperative Events Since the Mekong River Commission Establishment 预览
8
作者 FENG Yan WANG Wenling +2 位作者 SUMAN Daniel YU Shiwei HE Daming 《中国地理科学:英文版》 SCIE CSCD 2019年第1期58-69,共12页
The Lancang-Mekong River has attracted much attention from researchers, but the cooperation on water issues in this river basin has been limited, even after the establishment of the Mekong River Commission(MRC). Coope... The Lancang-Mekong River has attracted much attention from researchers, but the cooperation on water issues in this river basin has been limited, even after the establishment of the Mekong River Commission(MRC). Cooperation on water resources has been determined as one of the key priority areas in the Lancang-Mekong Cooperation Mechanism, but there are no details of targets. In order to establish the priorities of water cooperation under the mechanism, we adopted nine categories to classify the objectives of 87 water cooperation events based on the ‘Lancang-Mekong Water Cooperative Events Database’ from 1995 to 2015. Based on the occurrence of cooperative events, cooperative objectives, cooperative scales, and approaches to cooperation, we conducted statistical, correlation, and text analyses. Our analyses indicated the following results: under the impact of economic conditions inside and outside the river basin, full cooperation appeared more difficult than bilateral and multilateral cooperation. Each of the partners adopted different preferences for cooperation targets. Cooperation with more definite objectives was easier to establish than cooperation with broader and more complex objectives. The potential objectives for water cooperation were navigation, hydropower, joint management, data sharing, flood control and water use. Because hydropower development is controversial, and because water cooperation is avoided by most existing regional cooperation mechanisms due to its complexity, we suggest the following priority areas for water cooperation in the Lancang-Mekong River Basin. 1) Navigation and flood control/drought relief are attractive objectives for all the riparian countries across the whole watershed. 2) Data sharing should be a priority for cooperation in the watershed due to its laying the foundation for the equitable and reasonable utilization of transboundary waters. 3) Hydropower is an objective best implemented mainly through bilateral cooperation, and on tributaries. 展开更多
关键词 water COOPERATION objective COOPERATIVE scale the Lancang-Mekong RIVER riparian country MEKONG RIVER COMMISSION
在线阅读 下载PDF
Alignment of social and ecological structures increased the ability of river management
9
作者 Shuai Wang Bojie Fu +3 位作者 Orjan Bodin Jianguo Liu Mengmeng Zhang Xiaoyan Li 《科学通报:英文版》 SCIE EI CSCD 2019年第18期1318-1324,共7页
Large hydrologic basins involve multiple stakeholders,and coupled dynamic social and ecological processes.Managing such basins has long been a challenge.Balancing the demand for water from nature against that from hum... Large hydrologic basins involve multiple stakeholders,and coupled dynamic social and ecological processes.Managing such basins has long been a challenge.Balancing the demand for water from nature against that from humans is always difficult,particularly in arid watersheds.Here,we analyze potential institutional causes of ecological degradation and how it can be reversed by introducing new forms of governa nee.The framework and assumptions are illustrated using China's sec on d-largest en dorheic basin,where empirical evidence shows that the introduction of a new governing authority connecting midstream and downstream actors facilitated the establishment of a new governance regime that is better aligned with the biophysical scales of the watershed.A trans-regional water allocation project initiated by the new higher-level authority successfully rescued downstream oases and restored a dried terminal lake.These outcomes suggest that when social and ecological structures are better aligned our ability to manage the interplay between social and ecological processes increases.However,the lack of direct connection between the actors of the middle and lower reaches resulted in the paradox of an increase in water demand.We therefore suggest that measures to stimulate the emergence of horizontal social ties linking different critical groups of actors across the watershed could further the alignment of the institutional and biophysical structures—without these changes sustainable management of river basins and other common pool resources will remain problematic. 展开更多
关键词 River management Heihe River Social ecological system Institutional fit
Hydrological and water cycle processes of inland river basins in the arid region of Northwest China
10
作者 CHEN Yaning LI Baofu +2 位作者 FAN Yuting SUN Congjian FANG Gonghuan 《干旱区科学:英文版》 SCIE CSCD 2019年第2期161-179,共19页
The increasing shortage in water resources is a key factor affecting sustainable socio-economic development in the arid region of Northwest China(ARNC). Water shortages also affect the stability of the region’s oasis... The increasing shortage in water resources is a key factor affecting sustainable socio-economic development in the arid region of Northwest China(ARNC). Water shortages also affect the stability of the region’s oasis ecosystem. This paper summarizes the hydrological processes and water cycle of inland river basins in the ARNC, focusing on the following aspects: the spatial-temporal features of water resources(including air water vapor resources, runoff, and glacial meltwater) and their driving forces;the characteristics of streamflow composition in the inland river basins;the characteristics and main controlling factors of baseflow in the inland rivers;and anticipated future changes in hydrological processes and water resources. The results indicate that:(1) although the runoff in most inland rivers in the ARNC showed a significant increasing trend, both the glaciated area and glacial ice reserves have been reduced in the mountains;(2) snow melt and glacier melt are extremely important hydrological processes in the ARNC, especially in the Kunlun and Tianshan mountains;(3) baseflow in the inland rivers of the ARNC is the result of climate change and human activities, with the main driving factors being the reduction in forest area and the over-exploitation and utilization of groundwater in the river basins;and(4) the contradictions among water resources, ecology and economy will further increase in the future. The findings of this study might also help strengthen the ecological, economic and social sustainable development in the study region. 展开更多
关键词 water resources climate change RIVER RUNOFF BASEFLOW streamflow composition INLAND RIVER basin ARID region of Northwest China
GRACE observed mass loss in the middle and lower Yangtze basin
11
作者 Jiangjun Ran Natthachet Tangdamrongsub +3 位作者 Junchao Shi Changqing Wang Lihui Wang Xiaoyun Wan 《大地测量与地球动力学:英文版》 2019年第2期157-162,共6页
Anthropogenic architectures have a significant impact to the environment. The Three Gorges Dam(TGD),as the largest dam in the world, is a typical example, and has influenced the mass anomalies transported by the flow ... Anthropogenic architectures have a significant impact to the environment. The Three Gorges Dam(TGD),as the largest dam in the world, is a typical example, and has influenced the mass anomalies transported by the flow downstream in the Yangtze River since June 2003. However, the evidence of TGD influence on downstream mass transportation is not documented. In this study, we analyze the monthly gravity solutions from GRACE to investigate the downstream mass variations of Yangtze River. From our results,the considerable mass loss is detected in the downstream of TGD. By comparing our estimations with the in situ water level data of TGD, we find that the mass variations derived from GRACE at Datong station decreases shortly after the impoundment of TGD. This confirms a strong connection between them.Furthermore, by comparing with the in situ sediment load and river discharge at Yichang and Datong gauging stations, we find that the sediment load data shows a similar mass loss signature while the river discharge of both stations has stay at a relative stable level. This indicates that further study is still needed to understand the mechanism better. 展开更多
关键词 GRACE Mass loss The YANGTZE RIVER BASIN Sediment load RIVER discharge
Zhu Xianmo -- The Man Who Harnessed the Power of China’s Mother River 预览
12
作者 DANG XIAOFEI 《今日中国:英文版》 2019年第5期48-49,共2页
THE Yellow River is the second longest river in China and called the cradle of Chinese civilization. With a drainage area totaling 750,000 square kilometers, it runs 5,464 kilometers through nine provinces and autonom... THE Yellow River is the second longest river in China and called the cradle of Chinese civilization. With a drainage area totaling 750,000 square kilometers, it runs 5,464 kilometers through nine provinces and autonomous regions before emptying into the Bohai Sea. 展开更多
关键词 China’s MOTHER RIVER YELLOW RIVER
在线阅读 下载PDF
Quantitative analysis of planation surfaces of the upper Yangtze River in the Sichuan-Yunnan Region, Southwest China
13
作者 Fenliang LIU Hongshan GAO +2 位作者 Baotian PAN Zongmeng LI Huai SU 《地球科学前沿:英文版》 SCIE CAS CSCD 2019年第1期55-74,共20页
Identification of the planation surfaces (PSs)is key for utilizing them as a reference in studying the long- term geomorphological evolution of the Upper Yangtze River Basin in the Sichuan-Yurman region,Southwest Chin... Identification of the planation surfaces (PSs)is key for utilizing them as a reference in studying the long- term geomorphological evolution of the Upper Yangtze River Basin in the Sichuan-Yurman region,Southwest China.Using a combined method of DEM-based fuzzy logic and topographic and fiver profiles analysis and based on a comprehensive analysis of four morphometfic parameters:slope,curvature,terrain raggedness index, and relative height,we established the relevant fuzzy membership functions,and then calculated the membership degree (MD)of the study area.Results show that patches with a MD>80% and an area>0.4 km^2 correspond well to the results of Google Earth and field investigation,representing the PS remnants.They consist of 1764 patches with an altitude,area,mean slope,and relief of mostly 2000-2500 m above sea level (asl),0-10 km^2,4°-9°,0-500 m,respectively,covering 9.2% of the study area's landscape,dipping to southeast,decreasing progressively from northwest to southeast in altitude,and with no clear relation between each patch's altitude and slope,or relief.All these results indicate that they are remnants of once regionally continuous PSs which were deformed by both the lower crust flow and the faults in upper crust,and dissected by the network of Upper Yangtze River.Additionally,topographic and river profiles analysis show that three PSs (PS1-PS3)well developed along the main valleys in the Yongren-Huili region, indicating several phases of uplift then planation during the Late Cenozoic era.Based on the incision amount deduced from projection of relict river profiles on PSs, together with erosion rates,breakup times of the PS 1,PS2,and PS3 were estimated to be 3.47 Ma,2.19 Ma,and 1.45 Ma,respectively,indicating appearance of modem Upper Yangtze River valley started between the Pliocene to early Pleistocene. 展开更多
关键词 planation surface fuzzy logic topographic ANALYSIS RIVER profile ANALYSIS Upper YANGTZE RIVER SOUTHWEST China
Comparison of detrital mineral compositions between stream sediments of the Yangtze River (Changjiang) and the Yellow River (Huanghe) and their provenance implication 预览
14
作者 Zhong-bo Wang Ri-hui Li +4 位作者 Shou-ye Yang Feng-long Bai Xi Mei Jian Zhang Kai Lu 《中国地质(英文)》 2019年第2期169-178,共10页
A comparative comparative study on the detrital mineral composition of stream sediments of the Yangtze River (Changjiang) and Yellow River (Huanghe) shows that, light minerals of the Yangtze River basin were mainly qu... A comparative comparative study on the detrital mineral composition of stream sediments of the Yangtze River (Changjiang) and Yellow River (Huanghe) shows that, light minerals of the Yangtze River basin were mainly quartz, feldspar, and detritus, the compositional characteristics of light minerals differed among tributaries, the main stream had a generally higher maturity index than tributaries;heavy mineral content tended to decrease progressively from the upper stream to lower stream of the Yangtze River, the primary assemblage was magnetite-hornblende-augite-garnet-epidote, and diagnostic minerals of different river basins were capable of indicating the nature and distribution of the source rock. Detrital mineral assemblages in sediments of tributaries and the main stream of the Yellow River were basically similar, Primary heavy mineral assemblage was opaque mineral-garnet-epidote-carbonate mineral and alteration mineral. Variations in the contents of garnet, opaque mineral, and hornblende mainly reflected the degree of sedimentary differentiation in suspended sediment and the hydrodynamic intensity of a drainage system. The heavy mineral differentiation index F revealed sedimentary differentiation of diagnostic detrital mineral composition due to changes in regional hydrodynamic intensity and can serve as an indicator for studying the dynamic sedimentary environment of a single-provenance river and the degree of sedimentary differentiation of its detrital minerals. Changes in detrital mineral content of the Yellow River was not completely controlled by provenance but reflected gravity sorting of the detrital mineral due to variations in the ephemeral river hydrodynamic intensity and sedimentary environment, however the index changing of Yangtze River were mainly influenced by the complex sediment sources. Therefore caution must be exercised in using the detrital mineral composition of marginal sea to determine the contribution of the Yangtze River and Yellow River. 展开更多
关键词 Yangtze RIVER Yellow RIVER Sediment DETRITAL mineral PROVENANCE IMPLICATION
在线阅读 免费下载
Evaluating Suitability of Multiple Precipitation Products for the Lancang River Basin 预览
15
作者 TANG Xiongpeng ZHANG Jianyun +7 位作者 WANG Guoqing YANG Qinli YANG Yanqing GUAN Tiesheng LIU Cuishan JIN Junliang LIU Yanli BAO Zhenxin 《中国地理科学:英文版》 SCIE CSCD 2019年第1期37-57,共21页
Global reanalysis precipitation products could provide valuable meteorological information for flow forecasting in poorly gauged areas, helping to overcome a long-standing challenge in the field. But not all data sour... Global reanalysis precipitation products could provide valuable meteorological information for flow forecasting in poorly gauged areas, helping to overcome a long-standing challenge in the field. But not all data sources are suitable for all regions or perform the same way in hydrological modeling, so it is essential to test the suitability of precipitation products before applying them. In this study, five widely used global high-resolution precipitation products-Asian Precipitation Highly Resolved Observational Data Integration Towards Evaluation of Water Resources(APHRODITE), National Centers for Environmental Prediction Climate Forecast System Reanalysis(NCEP-CFSR), Climate Hazards Group InfraRed Precipitation with Station Data(CHIRPS), China Gauge-based Daily Precipitation Analysis developed by China Meteorological Administration(CMA) and Agricultural Model Intercomparison and Improvement Project based on the NASA Modern-Era Retrospective Analysis for Research and Applications(AgMERRA)-were evaluated using statistical methods and a hydrological approach for their suitability for the Lancang River Basin. The results indicated that APHRODITE, CMA, AgMERRA and CHIRPS were more accurate precipitation indicators than NCEP-CFSR in terms of the multiyear average and seasonal spatial distribution pattern, all of the CHIRPS, Ag MERRA and APHRODITE perform better than CMA and NCEP-CFSR at the small, medium and high precipitation intensities ranges in subbasin11 and sunbabsin46. All five products performed better in subbasin46(a low-altitude region) than in subbasin11(a high-altitude region) on the daily and monthly scales. In addition to NCEP-CFSR, the other four products all presented encouraging potential for streamflow simulation at daily(Yunjinghong) and monthly(Yunjinghong, Jiuzhou and Gajiu) scale. Hydrological simulations forced with APHRODITE were the best of the five for the Yunjinghong station in capturing daily and monthly measured streamflow. Except for NCEP-CFSR, all products were very good for hydrologic 展开更多
关键词 MULTIPLE PRECIPITATION PRODUCTS SUITABILITY evaluation the Lancang River BASIN
在线阅读 下载PDF
Implementing of the JPWSPC method in RIV1H for unsteady flow modeling in general river networks 预览
16
作者 Dejun Zhu Yongcan Chen 《国际泥沙研究:英文版》 SCIE 2019年第4期379-386,共8页
RIV1H is the stand-alone hydraulic program of CE-QUAL-RIV1, a longitudinal hydraulic and water quality model developed by U.S. Army Corps of Engineers Waterways Experiment Station. RIV1H solves the Saint-Venant equati... RIV1H is the stand-alone hydraulic program of CE-QUAL-RIV1, a longitudinal hydraulic and water quality model developed by U.S. Army Corps of Engineers Waterways Experiment Station. RIV1H solves the Saint-Venant equations using the widely accepted four-point implicit Preissmann scheme, and the resulting nonlinear equations are solved using the Newton-Raphson method. RIV1H is capable of simulating multiple branches, and in-stream hydraulic control structures. It treats tributary networks using a double sweep algorithm based on upstream ordering of the branches. It treats the control structures following a downstream solution order, which also is based on the upstream ordering of the branches. Since an upstream ordering cannot be achieved for looped networks, RIV1H is only applicable to non-looped tributary networks. In the current study, the junction-point water stage prediction and correction (JPWSPC) method is extended to take into account the control structures and the method is used to improve the RIV1H model, enabling it to be applied to both non-looped and looped networks with in-stream hydraulic control structures. The JPWSPC method makes the linear equation system for each segment complete while maintaining the banded property, thus the system can be independently and efficiently solved. It has the advantages to be efficient, robust, and very suitable for parallel computing. The improved RIV1H model was tested using two idealized networks and the results demonstrated the success of the improvement. 展开更多
关键词 RIV1H Numerical hydraulic model RIVER network Control structure Junction-point water STAGE prediction and CORRECTION
在线阅读 下载PDF
基于河流生态系统健康的生态修复技术研究进展 被引量:2
17
作者 刘欢 杨少荣 王小明 《水生态学杂志》 CSCD 北大核心 2019年第2期1-6,共6页
随着人类对河流大规模开发利用,河流生态系统遭受严重破坏。近年来,生态修复引起了社会广泛关注,也取得了显著的进步。本文从河流生态系统特性和所受胁迫出发,介绍了河流健康概念和评价方法,回顾了国内外河流生态修复相关研究发展历程,... 随着人类对河流大规模开发利用,河流生态系统遭受严重破坏。近年来,生态修复引起了社会广泛关注,也取得了显著的进步。本文从河流生态系统特性和所受胁迫出发,介绍了河流健康概念和评价方法,回顾了国内外河流生态修复相关研究发展历程,归纳了河流生态修复的理念,并以河流健康因素为基础,总结了水量、连通性、水质、水生生物4个方面的生态修复技术及其实践案例,最后根据当前研究的不足,提出了河流生态修复的3个研究方向,以期为未来的修复实践提供参考和指导。 展开更多
关键词 河流 生态系统 生态修复 修复技术
Distribution and Susceptibility Assessment of Collapses and Landslides in the Riparian Zone of the Xiaowan Reservoir 预览
18
作者 ZHONG Ronghua HE Daming +3 位作者 HU Jinming DUAN Xingwu HUANG Jiangcheng CHENG Xupeng 《中国地理科学:英文版》 SCIE CSCD 2019年第1期70-85,共16页
The southwest alpine gorge region is the major state base of hydropower energy development in China and hence planned many cascading hydropower stations. After the reservoir impoundment, the intense water level fluctu... The southwest alpine gorge region is the major state base of hydropower energy development in China and hence planned many cascading hydropower stations. After the reservoir impoundment, the intense water level fluctuations under the interaction of cascade dams operating and the mountainous flooding, usually cause bank collapse, landslide and debris flow hazards. The Xiaowan reservoir(XWR), for example, as the ‘dragon head’ meg reservoir located in the middle mainstream of Lancang River, have resulted in a series of geohazards during its building and operating. In this study, we investigated the number and surface area of collapses and landslides(CLs) occurred in the water level fluctuations zone(WLFZ) of XWR using remote sensing images of Gaofen-1 and Google Earth;evaluated the CLs susceptibility using information value method. The results presented that the total WLFZ area of 87.03 km2 and 804 CLs masses with a total area of 1.98 km2 were identified in the riparian zone of XWR. CLs mainly occurred at an elevation of 1190–1240 m, and the CLs density increased with an increase in altitude. The WLFZ with a slope gradient of 25°– 45° is the main CLs distribution area that accounts for more than half of the total CLs area. The susceptibility assessment revealed that high and very high susceptibility zones are generally distributed along zones with an elevation of 1210–1240 m, a slope degree of 25°–45° and a slope aspect perpendicular to the direction of Lancang River. Furthermore, these susceptible zones are close in distance to the dam site and tend to be in the riparian zones with the formation lithology of Silurian strata. These results provide a valuable contribution to prevent and control geohazards in the XWR area. Moreover, this study offers a constructive sample of geohazards assessment in the riparian zone of large reservoirs throughout the mountains of southwest China. 展开更多
关键词 SUSCEPTIBILITY assessment collapses and LANDSLIDES water level FLUCTUATIONS Xiaowan RESERVOIR Lancang-Mekong River
在线阅读 下载PDF
River Chief System (RCS):An experiment on cross-sectoral coordination of watershed governance
19
作者 Longfei Wang Jiaxin Tong Yi Li 《环境科学与工程前沿(英文)》 SCIE EI CAS CSCD 2019年第4期1-3,共3页
The trans-regional characteristics of watershed governance produce more problems beyond the capacity of each individual water-related department, leading to the fragmentation of watershed management. The River Chief S... The trans-regional characteristics of watershed governance produce more problems beyond the capacity of each individual water-related department, leading to the fragmentation of watershed management. The River Chief System (RCS) has experienced swift developments over the past decade in China by appointing the local government heads as river chiefs. RCS works efficiently in the short-term due to its superiority in the inclusion of clear responsibility, authority, and multi-sectoral collaboration. However, the characteristics of the authority-based vertical coordination of the hierarchical system remain unchanged, and therefore the problems of organizational logic and the responsibility dilemma still exist. Tasks including perfecting of laws, integrated watershed management, and public participation still need to be completed. RCS reflects the routine and characteristics of the migration of national governance, and as such provides new insights for other developing countries in the design of river management systems. 展开更多
关键词 RIVER CHIEF System WATERSHED GOVERNANCE Cross-sectoral COORDINATION Environmental protection
International Freight Forwarding Services Network in the Yangtze River Delta, 2005–2015: Patterns and Mechanisms 预览
20
作者 LIANG Shuangbo CAO Youhui +3 位作者 WU Wei GAO Jinlong LIU Weichen ZHANG Weiyang 《中国地理科学:英文版》 SCIE CSCD 2019年第1期112-126,共15页
This study examined the spatio-temporal trajectories of the international freight forwarding service(IFFS) in the Yangtze River Delta(YRD) and explored the driving mechanisms of the service. Based on a bipartite netwo... This study examined the spatio-temporal trajectories of the international freight forwarding service(IFFS) in the Yangtze River Delta(YRD) and explored the driving mechanisms of the service. Based on a bipartite network projection from an IFFS firm-city data source, we mapped three IFFS networks in the YRD in 2005, 2010, and 2015. A range of statistical indicators were used to explore changes in the spatial patterns of the three networks. The underlying influence of marketization, globalization, decentralization, and integration was then explored. It was found that the connections between Shanghai and other nodal cities formed the backbones of these networks. The effects of a city’s administrative level and provincial administrative borders were generally obvious. We found several specific spatial patterns associated with IFFS. For example, the four non-administrative centers of Ningbo, Suzhou, Lianyungang, and Nantong were the most connected cities and played the role of gateway cities. Furthermore, remarkable regional equalities were found regarding a city’s IFFS network provision, with notable examples in the weakly connected areas of northern Jiangsu and southwestern Zhejiang. Finally, an analysis of the driving mechanisms demonstrated that IFFS network changes were highly sensitive to the influences of marketization and globalization, while regional integration played a lesser role in driving changes in IFFS networks. 展开更多
关键词 international FREIGHT FORWARDING service NETWORK pattern mechanism headquarters-branch method YANGTZE River DELTA
在线阅读 下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部 意见反馈