Abstract
Dongting Lake is located at the downstream of Three Gorges Dam (TGD) and the hydrological drought is intensified after the impoundment of TGD as the dry period has been extended from 123 days/year before the operation of TGD (1981–2002) to 141 days/year (2003–2016) on average. Particularly, the Dongting Lake’s water shortage becomes very severe. To solve the problem caused by upstream dams, an innovative flood control scheme (IFCS) was introduced, and its feasibility of application in Dongting Lake is studied using the hydrodynamic module of Mike 21. The results show the IFCS can effectively convert the peak discharge of floodwater in wet seasons into water resources in dry seasons as the IFCS could significantly increase the usable water storage of the lake. For example, the usable water storage could increase to 2.85 billion m3 and 1.81 billion m3 in the extreme drought year of 2006 and 2011, respectively. The average increment of the water level would be about 0.4 m, 0.6 m, and 0.5 m in the West Dongting Lake (WDL), South Dongting Lake (SDL), and the East Dongting Lake (EDL), respectively, if the water stored in the inner lake was discharged uniformly in 30 days (27 November to 27 December 2006) with the application of IFCS. This study may provide an innovative method to alleviate the water shortage problem in Dongting Lake and other similar lakes.
Highlights
Lakes play an important role in the water supply for agricultural, industrial, commercial, and residential use
The results show that the model can simulate the water level selected stations in Dongting Lake
The results show that the water level increases significantly in Dongting Lake (SDL, Yingtian station), and East Dongting Lake (EDL, Chenglingji station) after the with the innovative flood control scheme (IFCS)
Summary
Lakes play an important role in the water supply for agricultural, industrial, commercial, and residential use. The extreme hydrological drought event happens more frequently in the lake area due to climate change and human activities in recent years [1]. LeadsWater to an overall reduction of the downstream water level, especially during the dry season; the hydrological drought in the downstream-linked lakes is intensified [5,9,10]. Its water level and water surface areas have been reduced significantly, show that, when compared with the pre-TGD period, the starting date of the dry season occurs earlier which is caused by the TGD after 2003 [12]. The stored water will be released when the gates are open to a huge amount of floodwater stored in the inner lake can be converted to water resources in regulate the outflow in the dry seasons. The feasibility of applyingstation, the IFCSwhich to increase usablestation water storage of the water levelLake in Dongting
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