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Water 2018, 10(2), 225; https://doi.org/10.3390/w10020225

Preliminary Numerical Analysis of the Efficiency of a Central Lake Reservoir in Enhancing the Flood and Drought Resistance of Dongting Lake

1
School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China
2
Hunan Province Key Laboratory of Water, Sediment Sciences & Flood Hazard Prevention, Changsha 410114, Hunan, China
3
Hunan Provincial Communications Planning, Survey & Design Institute Co., Ltd., Changsha 410008, Hunan, China
*
Author to whom correspondence should be addressed.
Received: 12 December 2017 / Revised: 14 February 2018 / Accepted: 16 February 2018 / Published: 23 February 2018
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Abstract

During the past few decades, the ecosystems of lakes have been reshaped greatly by global climate change and expanding human activities. As the second largest freshwater lake in China, Dongting Lake is the most important regulating lake in the Yangtze River Basin because it has extensive flood storage capacity. The dynamic characteristics of its circulation and sediment transport are significantly affected by the scheduling and interception of control reservoirs at the upper reaches of the Yangtze River. In this paper, a central lake reservoir is proposed to improve the flood and drought resistance of Dongting Lake. The efficiency of the central lake reservoir is investigated numerically by developing a two-dimensional shallow water model. We demonstrate that current velocity and water elevation during flood and drought events can be influenced significantly by the construction of the central lake reservoir. The flood storage capacity of the central lake reservoir can reduce the peak flood elevation significantly in West Dongting Lake, which would enhance its flood resistance. The water replenishment of the central lake reservoir in the dry season can also efficiently increase the lake water elevation to enhance the drought resistance in the area surrounding the lake. Our findings have important implications for policy makers and their management of Dongting Lake. View Full-Text
Keywords: Dongting Lake; central lake reservoir; numerical simulation; flood control; drought resistance Dongting Lake; central lake reservoir; numerical simulation; flood control; drought resistance
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Liu, H.; Deng, B.; Liu, Y.; Jiang, C.; Wu, Z.; Long, Y. Preliminary Numerical Analysis of the Efficiency of a Central Lake Reservoir in Enhancing the Flood and Drought Resistance of Dongting Lake. Water 2018, 10, 225.

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