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Discussion papers | Copyright
https://doi.org/10.5194/nhess-2018-216
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 13 Sep 2018

Research article | 13 Sep 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Impacts of the emergency operation of the South-to-North Water Diversion Project’s eastern route on flooding and drainage in the water-receiving area: An empirical case from China

Kun Wang1,2, Zongzhi Wang2, Kelin Liu2, Liang Cheng2, Lihui Wang3, and Ailing Ye2,3 Kun Wang et al.
  • 1College of water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, China
  • 2State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
  • 3College of Civil Engineering, Fuzhou University, Fuzhou 350002, China

Abstract. The water levels of lakes along the eastern route of the South-to-North Water Diversion Project (ER-SNWDP) are expected to rise significantly and subsequently affect the process of flood control and drainage in those lake basins. However, few studies have focused on the impacts of interbasin water diversion on the flood control and drainage of water-receiving areas at the lake basin scale. Using MIKE software, this paper builds a coupled hydrodynamic model to address the existing literature gap on the impacts of interbasin water diversion on the process of flood control and drainage in a water-receiving lake basin, and it considers the many types of hydraulic structures in the model. First, a flood and waterlogging simulation model was constructed to simulate the interactions among the transferred water, waterlogging of the lakeside area surrounding Nansi Lake (NL), and water in NL and its tributaries. The ER-SNWDP was also considered in the model. Second, the model was calibrated and verified with measured data, and the results showed that the model is efficient and presents a Nash-Sutcliffe efficiency coefficient (NSE) between 0.65 and 0.99. Third, the process of flood and drainage in the lakeside area of NL was simulated under different water diversion and precipitation values. Finally, the impacts of emergency operations of the ER-SNWDP on flood control and waterlogging drainage in the lakeside area of NL were analyzed based on the results from the proposed model, and selected implications are presented for the integrated management of the interbasin water diversion and the affected lakes.

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Short summary
To assess the impacts of the eastern route of the South-to-North Water Diversion Project (ER-SNWDP) of China on water-receiving area’s floods and waterlogging, a coupled 1D/2D hydrodynamic model is built, taking Nansi Lake Basin as an example. Some impacts especially for emergency operations were analyzed, and selected implications are presented for the integrated management of large scale interbasin water diversions.
To assess the impacts of the eastern route of the South-to-North Water Diversion Project...
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