关中东部河道变迁对自然环境的影响

Influence on Natural Environment by the Changes of River Courses in Eastern Guanzhong

关中东部为黄渭洛交汇区 ,历史时期黄渭洛河道的变迁对这一带自然环境的影响重大 ,不但使三河河谷展宽 ,沙洲沙地增多 ,而且使泥沙淤积 ,河床抬高 ,两岸滩地兴废频繁 ;同时还使支流入河口不断发生变化 ,特别是对关中沙苑特殊地形的形成提供了泥沙。

Eastern Guanzhong is an area that Huanghe river, Weihe river, and Luohe river converge. In history, the changes of river courses of these river had taken great influences on its regional natural environment, which not only had made river valleys of the three rivers more wider, taken more sandbanks and sand, but also had made the mud and sand silted up, the riverbeds raised, the sands by the two sides of those river; frequently flourishing or abandoning . Meanwhile those changes had made the river mouths of the tributaries unceasingly changed, especially supplied the formation of the special terrain of Shayuan in Guanzhong with the mud and the sands.