龙羊峡水库周围风沙流的观测、计算及对库区的影响

MEASUREMENT AND COMPUTATION OF WIND-SAND FLOW WITHIN THE AREA AROUND LONG YANGXIA RESERVOIR AND ITS EFFECT ON THE RESERVOIR AREA

为估计龙羊峡水库进库风沙量及其对库区的影响,在库西北流沙带进行了长达一年的风沙观测。并在分析观测数据的基础上总结出了计算断面输沙率的通用经验公式,也给出了断面通量系数、起沙风速和粒径之间的关系。用所得公式算出年均进库风沙量为141万立方米,它对库容的影响可不计,但将严重危害农牧业生产和地面设施,也会污染环境。

In order to predict the wind-sand amount entering the Jong Tang-Xia reservoir and the effect of it on the reservoir area,the measurement of wind- sand flow lasted one year in the desert north-west of the reservoir. Based on analysis of the data measured, a general expression of computing the transport rate of sand passing a section with per unit width.The relationship between section flux coefficient and sand diameter is found, also found is the relationship between starting-sand wind speed and sand diameter. By using these expressions the average sand amount getting into the reservoir is com- puted, it is about 141×10~4 cube meters for one year. Thus the effect of this sand amount on the capacity of reservoir can be neglicted. However, the wind-sand flow will seriously harm the installations on ground and damage the agriculture and animal husbandry productions and also pollute environment.