洪泽湖换水能力的时空分布特征EI北大核心CSCD

为研究洪泽湖换水能力的时空分布特征,基于MIKE21建立洪泽湖二维水动力模型,模拟分析了洪泽湖不同湖区的换水周期;考虑洪泽湖的流场呈现风生流和吞吐流双重特点,分析了不同季节和不同风场条件下换水周期的空间变化特征。结果表明:洪泽湖换水周期空间异质性明显,从南到北梯度递增,冬季和春季全湖平均换水周期较长,分别为75 d和60 d,秋季和夏季的全湖平均换水周期较短,分别为49 d和31 d;实际风场对洪泽湖的换水能力起到正向作用,东南风对洪泽湖的换水能力起正向作用,东北风对洪泽湖的换水能力起到抑制作用。

Spatial and temporal distribution characteristics of water exchange capacity in Hongze Lake

In order to study the temporal and spatial distribution characteristics of water exchange capacity of Hongze Lake, a two-dimensional hydrodynamic model of Hongze Lake was established based on MIKE21, and the water exchange cycles in different lake areas of Hongze Lake were simulated and analyzed. Considering the dual characteristics of wind-driven flow and throughput flow in the flow field of Hongze Lake, the spatial variation characteristics of water exchange period in different seasons and different wind fields were analyzed. The results show that the spatial heterogeneity of water exchange period in Hongze Lake is obvious, increasing from south to north. The average water change cycle of the whole lake is longer in winter and spring, which are 75.d and 60.d respectively, and shorter in autumn and summer, which are 49.d and 31.d respectively. The actual wind field has a positive effect on the water exchange capacity of Hongze Lake, the southeast wind has a positive effect on the water exchange capacity of Hongze Lake, and the northeast wind has an inhibitory effect on the water exchange capacity of Hongze Lake.