Details

Autor(en) / Beteiligte

• Wang, Xiuying
• Li, Xiang
• Baiyinbaoligao
• Wu, Yihong

Titel

Maintaining the connected river-lake relationship in the middle Yangtze River reaches after completion of the Three Gorges Project

Ist Teil von

• International journal of sediment research, 2017-12, Vol.32 (4), p.487-494

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• After operation of the Three Gorges Project (TGP), there is a new evolution tendency for rivers and lakesin the middle reaches of the Yangtze River (i.e. the Ching River reaches). In recent years, the weakeningconnection relationship between the Yangtze River and Dongting Lake has resulted in a series of problemsfor flood regulation, water resources utilization, and aquatic ecosystem protection in the river-lakejoint area. In this paper, the hydrological characteristics and fluvial processes within the river-lake jointarea are studied, and possible management strategies to maintain the connected river-lake relationshipare proposed. To achieve this objective, the evolution tendency, such as the zero-flow problem and riverregime for three major outlets (i.e. the Songzi Outlet, Taiping Outlet, and Ouchi Outlet) to Dongting Lakefrom the Yangtze River, is analyzed. It is believed that the Songzi Outlet has a comparative advantage inflow diversion over the other two outlets. The Range of Variability Approach is introduced to identifyhydrological characteristics at the Songzi Outlet. Several characteristic values of flow diversion from thisoutlet during drought periods are determined. Then, the fluvial processes in the river-lake joint area are studied by comparing topographic maps and using control gauge station data of various years. The water and sediment flux are analyzed before and after operation of the TGP. Finally, based on the results obtained, two possible management strategies are recommended and corresponding parameters are estimated to strengthen and maintain the connected river-lake relationship. This analysis takes into account operation of the TGP, mainstream shift and increasing riverbed scour in the Ching River channel. To restore the flow diversion condition to that in the 1950s or 1960s (i.e. 140 m3/s of flow diversion corresponding to 5500 m3/s of flow at the Zhicheng station), it is estimated that the river channel around the Songzi Outlet should be dredged 1.4 m under the current riverbed situation, and other corresponding improvement measures for Songzi River channels should also be implemented. & 2017 International Research and Training Centre on Erosion and Sedimentation/the World Association for Sedimentation and Erosion Research. Published by Elsevier B.V. All rights reserved.