parallel drainage造句

It is found that the automatic detection of drainage networks from digital elevation models is affected by flat areas and closed depressions . a variety of methods have been proposed to treat these two features , but it can be seen that the flat areas and closed depressions are processed only after they have been created , so that many spurious and parallel drainage courses are generated
数字高程模型( dem )已在分布式流域水文模型中得到了越来越广泛的应用，但dem中的闭合洼地和平坦区域影响着流域河网的自动提取。目前已提出好多方法来处理这两种地形，但均针对已经形成的dem单元网格进行处理，结果往往生成伪河道及平行河道。
It's difficult to find parallel drainage in a sentence. 用parallel drainage造句挺难的