太湖大浦口湖区湖流特征分析

湖流是造成湖泊污染扩散,泥沙起动与输移等过程的主要动力学因素。构成湖水运动的物理机制很杂。风将其部分能量传给湖水,湖水在湖盆形态因素制约下,在吸收风能的同时,产生摩擦流。在派生力场,水位压力梯度场的作用下,形成风波流及补偿流。另外,由于湖水定振振荡而引起的波流也是重要形式。湖泊中以密度流和吞吐流形式存在的流场一般较弱。本文所分析的湖流,实为各种形式湖流的合成流。

A STUDY ON CHARACTER OF WATER CURRENT DAPU MOUTH REGION OF LAKE TAI

In the area of Dapu rever mouth, lake currents are formed mainly by the unhomogeneous distribution of water level which is created by the wind fields. So the lake currents include pressure gradient currents, secondary frictional current and complementary current. The periodic features of the currents are complex. The longest period is 9.5 days, and the shortest is ten munites or more. The current distribution in vertical direction has stratification feature obviously. The directions of upper and lower-layer currents form a steady shear angle which is controlled by the topography of the basin, the direction of the shore line and the veriation of the water level in the area. There is an excellent correlation between current velocity and wind velocity in spite of the complex lake basin and changeable wind fields.