Wide river or narrow river:Future river training strategy for Lower Yellow River under global change  

作　　者：Xiaonan Li Deyu Zhong Y.Joseph Zhang Yanjun Wang Yongqiang Wang Hongwu Zhang 

机构地区：[1]State Key Laboratory of Hydroscience and Engineering,Department of Hydraulic Engineering,Tsinghua University,Beijing 100084,China [2]Joint-Sponsored State Key Laboratory of Plateau Ecology and Agriculture,QingHai University,Xining 810016,China [3]Center for Coastal Resource Management,Virginia Institute of Marine Science,1375 Greate Road,P.O.Box 1346,Gloucester Point,VA 23062,USA [4]Changjiang Institute of Survey,Planning,Design and Research,Wuhan 430010,China [5]Water Resources Department,Changjiang River Scientific Research Institute,Wuhan 430010,China

出　　处：《International Journal of Sediment Research》2018年第3期271-284,共14页国际泥沙研究（英文版）

基　　金：sponsored by the Special Funds for Public-Good Research Project of Ministry of Water Resources in China(Grant No.201401002);the Key Projects in the National Science&Technology Support Program during Thirteenth Five-Year Plan Period in China(Grant No.2016YFC0402500);National Natural Science Foundation of China(Grant Nos.91547204 and 51379102);supported by the Tsinghua National Laboratory for Information Science and Technology in China

摘　　要：The choice of a river training strategy is extremely important for the Lower Yellow River （LYR）. Currently, the wide-river training strategy applies in the training of the LYR. However, remarkable changes in the hydrological processes in the Yellow River basin, as well as immediate pressure from socio-economic development in the Yellow River basin, make it necessary to consider if there is a possibility to change the river training strategy from wide-river training to narrow-river training. This research investigates the impacts of different river training strategies on the LYR through numerical simulations. A one- dimensional （l-D） model was used to simulate the fluvial processes for the future 50 years and a three- dimensional （3-D） model was applied to study typical floods. The study focused on river morphology, the results show that if the present decreasing trend in both water discharge and sediment load persists, the deposition rate in the LYR will further decrease no matter what strategy is applied. Especially, narrow- river training can achieve the aim to increase the sediment transport capacity in the LYR compared with wide-river training. However, if the incoming water and sediment load recovers to the mean level of the last century, main channel shrinkage due to sedimentation inevitably occurs for both wide-river and narrow-river training. Most importantly, this study shows that narrow-river training reduces the deposition amount over the whole LYR, but it provides little help in alleviating the development of the ＂suspended river＂. Instead, narrow-river training can cause aggradation in the transitional reach where the river pattern changes from highly wandering to meandering, further worsening the ＂hump deposition＂ there. Because of uncertainty regarding future changes in hydrological processes in the Yellow River basin, and the lack of feasible engineering measures to mitigate ＂suspended river＂ and ＂hump deposition＂ problems in the LYR, caution should be exercised with reThe choice of a river training strategy is extremely important for the Lower Yellow River （LYR）. Currently, the wide-river training strategy applies in the training of the LYR. However, remarkable changes in the hydrological processes in the Yellow River basin, as well as immediate pressure from socio-economic development in the Yellow River basin, make it necessary to consider if there is a possibility to change the river training strategy from wide-river training to narrow-river training. This research investigates the impacts of different river training strategies on the LYR through numerical simulations. A one- dimensional （l-D） model was used to simulate the fluvial processes for the future 50 years and a three- dimensional （3-D） model was applied to study typical floods. The study focused on river morphology, the results show that if the present decreasing trend in both water discharge and sediment load persists, the deposition rate in the LYR will further decrease no matter what strategy is applied. Especially, narrow- river training can achieve the aim to increase the sediment transport capacity in the LYR compared with wide-river training. However, if the incoming water and sediment load recovers to the mean level of the last century, main channel shrinkage due to sedimentation inevitably occurs for both wide-river and narrow-river training. Most importantly, this study shows that narrow-river training reduces the deposition amount over the whole LYR, but it provides little help in alleviating the development of the ＂suspended river＂. Instead, narrow-river training can cause aggradation in the transitional reach where the river pattern changes from highly wandering to meandering, further worsening the ＂hump deposition＂ there. Because of uncertainty regarding future changes in hydrological processes in the Yellow River basin, and the lack of feasible engineering measures to mitigate ＂suspended river＂ and ＂hump deposition＂ problems in the LYR, caution should be exercised with re

关 键 词：Lower Yellow River River training Water-sediment interactions Numerical modeling Hump deposition 

分 类 号：TV882.1[水利工程—水利水电工程]