永靖黑方台灌区台面沉陷灾害、水土流失及防治

Land Surface Settlement, Soil Loss and Corresponding Harness in Heifangtai Irrigation Area in Yongjing County

传统的灌溉方式，长年的大水漫灌、超灌，造成了黑方台灌区大面积的台面沉陷、水土流失等环境地质灾害。大量灌溉水渗入农田，是导致土体潜蚀加剧并造成灾害的直接原因。通过探讨灌区黄土沉陷与水土流失的机理，提出了从治水入手，采用先进的节水灌溉技术，配合工程措施及植物措施治理，达到合理利用水资源、根治水土流失、改善区域环境地质条件的目的。

Some environmental and geological disasters like land surface settlement in large areas, soil loss and others in Heifangtai irrigation area are brought about by conventional irrigation model such as flooding and over irrigation. The main direct cause of the disasters is that large volume of irrigation water filtrates into farmland and consequently leading to intensifying subsurface erosion. It is put forward in the paper, through study of the mechanism of Loess settlement and soil loss in the irrigation area, that by starting with water control, applying advanced water saving irrigation techniques and combining with engineering and vegetative treatment control to reasonably utilize water resource, completely control soil loss and improve the regional environment and geological conditions.