基于数值模拟的鄱阳湖水利枢纽工程对湖泊水面的影响研究

Study on influence of Poyang Lake hub project on lake surface based on numerical simulation

为研究拟建的鄱阳湖水利枢纽工程对鄱阳湖水面变化的影响,利用构建的鄱阳湖二维水动力模型,按照规划中的鄱阳湖水利枢纽工程调度方案,通过丰平枯典型年份的情景模拟,分别从湖泊丰水期和枯水期两个时间段,选择鄱阳湖丰、平、枯3种典型年型,在无枢纽与有枢纽两种情景模拟的基础上,定量分析了3种典型年枢纽工程的不同水位调度阶段对湖泊淹水频率、水位和水面面积的可能影响。结果显示:(1)鄱阳湖水利枢纽工程建立后淹水频率无变化的区域都是常年有水的地方,湖泊淹水频率变化大于0的地方多为浅湖区和湖滩草洲;(2)枢纽抬升水位作用明显的区域主要集中在入江水道,棠荫附近和湖滩草洲,无水位抬升的区域主要在一些小湖区和湖滩草洲,无水位抬升范围最大的时期为枢纽蓄水期的丰水年型;(3)在鄱阳湖淹水频率、水位和水面面积方面,鄱阳湖水利枢纽工程对其增加幅度在枯水年型最大,对其有增加作用的湖泊范围在丰水期最大。

In the context of complex relationship of river and lake caused by Poyang Lake hub project that is to be construc- ted, we construct a two-dimension water dynamic model of Poyang Lake, and conduct the numerical simulation of high flow year and low flow year according to the control scheme of Poyang Lake hub project that is being planned. We conduct a quantitative research on the possible influence of different water level control operation of the three kinds of typical hydraulic projects during high flow,normal flow and low flow periods on the frequency of lake flooding,water level and water area,and the frequency of key lake flooding and water level change. The result show that ： （ 1 ） the flooding frequency in the area that is always flooded with water does not increase, but the flooding frequency of shallow lake and wetland increases ; （ 2 ） the main area with obvious water level lifting effect is located at the entrance of river,and the main area with little water level lifting effect is located at the shallow lake and wetland;and （3）Poyang Lake hub project helps to increase the flooding frequency, water level nd water area during the low flow years, and helps to increase the lake range during the high flow years.