调水期风场对淮河入江水道浅水湖泊水动力水质的影响研究

Study on the effect of wind field on hydrodynamic water quality of shallow lakes in Huaihe River watercourse entering Yangtze River during the water diversion period

为研究调水期风场对淮河入江水道高邮湖、邵伯湖输水流场的影响,采用MIKE21 Flow Model建立研究区域的二维风生流数值模型,在盛行风场作用下分析两湖泊的水动力变化与水质更新规律。结果表明:风荷载作用下,高邮湖内形成了多个形态迥异的风生环流,环流的流向、形状与风场的风向密切相关;新民滩控制线的上下级湖面是风涌增减水作用显著的区域,风速越高水位变幅越大,该水位变幅可能导致高邮泵站设计扬程与调水动力不足;风场的剪切拖曳作用对湖区水体与长江水体的更新置换规律也有影响,顺风条件下湖区水体水质的更新速度与程度显著提高,而逆风条件下水体更新强度则明显下降。

In order to study the effect of wind fields during the water diversion period on the water transmission fields of Gaoyou Lake and Shaobo Lake in the inlet waterway of the Huaihe River,a two-dimensional wind flow numerical model of the study area was established by MIKE21 Flow Model,and the hydrodynamic changes and water quality renewal laws of the two lakes were analyzed under the action of prevailing wind fields.The results show that under the action of wind load,wind circulations of different structure are formed in Gaoyou Lake,and the flow direction and shape of the circulation are affected by the wind direction of the wind field;the upper and lower lakes of the Xinmintan control line are more significant areas of wind surge,and the higher the wind speed,the greater the water level variation,which may lead to a low design head of the pumping station project and insufficient water transfer power;the shear and drag effect of the wind field also has an impact on the renewal and replacement law of the water bodies in the lake area and the Yangtze River,and the renewal speed and degree of the water quality in the lake area are significantly improved under downwind conditions.Under headwind conditions,the degree of renewal of water quality in the lake area is decreased significantly.