论文部分内容阅读
黄河上游来水来沙地区分布不均匀，水沙异源。大型水库修建前，来沙多，宁蒙河道淤积，５０年代淤积尤为严重。青铜峡、刘家峡水库运用后，水库大量拦沙，宁蒙河道发生冲刷。龙羊峡、刘家峡水库联合运用后，汛期蓄水削峰，出库中小水流量历时加长，大流量出现机会大大减少，宁蒙河道重新调整，主要表现在：水流挟沙能力降低；河道淤积严重，水位升高，平滩流量减小；河势摆动加剧，滩岸坍塌严重；西柳沟高含沙洪水淤堵干流呈加重趋势。建议加速多沙支流治理，在水资源分配上应减少枯水年用水量，并考虑宁蒙河道输沙用水量。
The distribution of water and sand in the upper reaches of the Yellow River is uneven, and water and sediment are heterogeneous. Large-scale reservoirs before the construction, to the sand, Ning Meng channel siltation, deposition in the 1950s is particularly serious. After the use of Qingtongxia and Liujiaxia reservoirs, a large number of reservoirs stopped sediment and the erosion of Ningmeng rivers landed. After the combination of Longyangxia and Liujiaxia reservoirs, the water storage in the flood season was peaked and the small and medium-sized water discharge from the reservoir extended for a long time. The opportunities for large flow were greatly reduced. The Ningmeng River was readjusted, mainly as follows: the sediment carrying capacity was reduced; , The water level increased and the flat beach flow decreased. The swings of the river regime intensified and the beach bank collapsed seriously. The silting flood of Xiliugou high flood was aggravating. It is suggested to speed up the administration of the tributaries of the more sandy areas, to reduce the annual dry-year water consumption in the distribution of water resources, and to consider the amount of sediment-carrying water in the Ning-Meng River.