The territory is crisscross with gullies, undulating ridges and ridges, alternating between Sichuan and Liang, and distributed in a strip from northwest to Southeast. The county is divided into four regions: surrounding mountains, central Loess hilly land, Yellow River Valley and Qinwangchuan fault basin. The study area is low-lying, the drainage ditch in farmland can not effectively play the role of flood drainage, leading to poor drainage. In case of rainstorm, farmland aggravates the flood damage<BR>
正在翻译中..