黄河中游韭园沟流域坝系发展过程及拦沙作用分析

Developing Process and Sediment Control Effect Analysis of Dam System in Jiuyuangou Valley of Middle Yellow River

韭园沟流域从１９５３年开始坝系建设，大致经过试验示范、发展、改建和充实提高４ 个阶段，建成坝库２６３ 座，淤地２８２ ｈｍ ２，拦泥２ ００８．５ 万ｍ ３。通过实测降雨、径流、输沙资料及不同流域对比分析表明，流域沟道坝系拦泥作用十分显著，目前沟道坝系年均减沙效益为７８．６％ ，流域输沙模数由治理前的１．８ 万ｔ／ｋｍ ２ 降到目前的２ ０６０ ｔ／ｋｍ ２，洪水泥沙基本得到控制，坝系接近相对稳定。

The construction of dam system in Jiuyuangou valley since 1953 undergoes about four stages including experimental Demonstration, development, reconstruction and improvement. It has constructed 263 blank of dam reservoirs, 282 hm 2 of silt lands and 20 085 00 m 3 of silts have been controlled. According to analysis on measured data of rainfall, runoff and sediment transport and contrast research between different valley, it shows that the dam system has very notable sediment control effect. Presently the annual mean sediment reduction profit is 78.6%, the valley sediment transport modulus has been reduced to 2 060 t/km 2 from 18 000 t/km 2 before harnessing, the flooding sediment is basically controlled. The dam system is relatively stable.