| Abstract: | The gully control projects in the Yellow River mainly include key gully control dam, silt-arrester, small-sized reservior, check dam, silted land project by flood and by narrowing the river bed. In the 1950's, the Yellow River basin started a new upsurge of construction of check dam.By now, the basin has set up 172 thousand of silt-arresters which silted 311. 3 thousand ha of land. By the end of 1994, the basin had set up 2881 of small-sized reserviors with total storage of 2. 9 billion m3 for the settlement of drought. In the early period of the 1980's, the construction of key gully control projects was put forward to solve the destruction problem of silt--arresters, by now there had established 900 key gully control projects with total storage of 1. 06 billion m3.The total basin had set up 518 thousand of gully control projects, retaining over 10 billion tons of sediment, silting 490. 4 thousand ha of land with high and stable yield, the average annual yield reached 1. 84 billion tons. There exsit some problems such as siltation of reservior, salinization o f dam land, too many dangerous dams. In the future, we should strengthen protection work, reinforcement and completion work in order to increase the benefit of gully control projects. |
