论文部分内容阅读
我国北方地区河流,大都属多沙河流。因河道输沙量大,含沙量高,水库淤积问题十分严重。据不完全统计,陕西、甘肃、山西、宁夏四省(区)每年平均被泥沙淤废的库容共达4.58亿米~3,等于每年报废一座大型水库。在一些水土流失严重地区,水库淤积速度之快更为惊人。陕西省杏河水库(库容为120万米~3),两年建成,一年淤满;库容为2180万米~3的山西
Most of the rivers in northern China are mostly sandy rivers. Due to the large volume of sediment transport in the river and high sediment concentration, the problem of reservoir siltation is very serious. According to incomplete statistics, the average volume of sediment silt waste in Shaanxi, Gansu, Shanxi and Ningxia provinces is 458 million m3 every year, which is equivalent to scrapping one large reservoir each year. In some serious soil erosion areas, the reservoir deposition rate is even more alarming. Shaanxi Province Xinghe Reservoir (storage capacity of 1.2 million meters to 3), built in two years, silting a year; storage capacity of 21.8 million meters to 3 Shanxi