三峡水库蓄水期不同调度方案对洞庭湖出口水位的影响

洞庭湖水情受到长江和四水的综合影响，因此三峡水库蓄水运行必将对洞庭湖出口水位产生影响。通过构建模型对洞庭湖出口的水位过程进行模拟，以三峡出库日均流量、洞庭湖四水合成日均流量为输入，城陵矶站日水位过程为输出，以量化和分析城陵矶水位变化受三峡水库调度的影响。通过三峡入库流量代替出库流量，还原自然状态下的水位过程，并根据各调度方案计算的出库流量模拟各调度方案下城陵矶的水位变化过程。对比各调度方案下三峡水库蓄泄水对洞庭湖出口水位的影响可以发现：各蓄水方案对洞庭湖出口水位都造成了一定的影响，起蓄时间较早的方案影响时间较长，整体上平均水位变化也较大，但起蓄后水位变化较为平缓；起蓄时间较晚的方案影响时间较短，整体上平均水位变化相对较小，但起蓄后水位变化较为剧烈。考虑到不同年份和不同来水类型情况对洞庭湖出口水位的影响存在差异，各蓄水方案的优劣需要具体分析和讨论

Impact of Different Refill Operation Rules of the Three Gorges Reservoir on the Water Level of the Outlet of Dongting Lake

The hydrological regime of Dongting Lake is affected by the Yangtze River and other four water inlets around the Dongting lake. The refill operation of the Three Gorges Reservoir（TGR）has a great impact on the water level of the outlet of Dongting Lake. In this paper, the water level simulation model is used to simulate the water level process of the outlet of Dongting Lake to quantify the influence of the Three Gorges Reservoir refill operation. The daily out flow rate of the Three Gorges Reservoir and the synthetic daily flow of other four water inlets around the Dongting Lake is the input and the daily water level of Chenglingji hydrological station（outlet of Dongting Lake）is output. In order to find out the Chenglingji hydrological station water level change process of returned to original condition that the Three Gorges Project is not carried out daily out flow rate of the Three Gorges Reservoir been replaced by the daily in flow rate. The out flow of the Three Gorges according to the calculate of different refill operation are used to substitute for measured daily out flow rate of the Three Gorges Reservoir as the input data to simulate the water level change process under the different operation. The influence of water level in Chenglingji hydrological station under different operation are been compared and the results proves that: The water refill operation have a great impact on the water level of the Chenglingji station. The earlier time refill operations have a long time influence and the average water level change is relatively large, but the water level process is relatively gentle. In the other hand, the earlier ones have a shorter time influence and the overall average water level changes is small, but the water level process is more dramatic. Different years and types of water source should be taken into account so the water level process needs the specific analysis and discussion