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来沙系数对河道冲淤的影响研究 预览

Study on the Influence of the Incoming Sediment Coefficient on the Scour and Sedimentation
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摘要 来沙系数以 S/Q表示,因为相同的流量流速可能不同,而流速是影响输沙能力的重要因素,所以来沙系数缺乏最基本的物理意义,是一个纯粹的经验指标;不少人认为黄河下游的临界来沙系数在 0.012左右,没有考虑滩槽冲淤性质的差别和上下河段河型的不同;就黄河泥沙而言,含沙量越大,泥沙浓度在垂线上越均匀,越容易输送;黄河下游窄深河槽洪水期具有多来多排的输沙特性,在实测资料范围内不存在临界来沙系数;不受来沙系数的限制,利用洪水集中排沙是解决黄河下游泥沙淤积最现实的途径. Incoming sediment coefficient is represented by S / Q , since the same flows differ in velocity , so the incoming sediment coefficient is a purely experiential index which has no basic physical significance;many consider that the critical incoming sediment coefficient at the downstream ofthe Yellow River is about 0.012 , which however takes no differences in natures of erosion and deposition and types of downstream and upstream of the river into consideration;with regard to the sediment of the Yellow River , the more the sediment is , the more even the sediment thickness along the vertical line and the easier it is conveyed;the flood period of narrow and deep riverbed at the downstream of the Yellow River is characterized of more flood and more flushing , which has no critical incoming sediment coefficient available;to make use of floods for concentrated sediment flushing is considered an important way to deal with sediment accumulation at the downstream of the Yellow River.
作者 冯宗 孙赞盈 彭红 尚红霞 白乐 FENG Zong;SUN Zanying;PENG Hong;SHANG Hongxia;BAI Le(Water Resources Department of Henan Province,Zhengzhou 450003,China;Yellow River Institute of Hydraulic Research,Zhengzhou 450003,China)
出处 《人民黄河》 CAS 北大核心 2019年第3期44-48,共5页 Yellow River
基金 国家重点研发计划项目(2017YFC0404402) 水利部公益性行业科研专项(201401002) 中央级公益性科研院所基本科研业务费专项(HKY-JBYW-2017-05).
关键词 高含沙洪水 河道冲淤 来沙系数 黄河 hyper?concentrated flood scour and sedimentation incoming sediment coefficient Yellow River
作者简介 冯宗(1964—),男,河南新安人,高级工程师,主要从事饮水安全技术研究与推广等工作E-mail:fengzong@hnsl.gov.cn.
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