According to the investigation of source and eroded condition of loose man dumped sediment in the urban area of Yanan, it has been found that the man dumped sediment from different sites will be gradually deliveried into river by water during rainy season or by man dumping.
在对延安市宝塔区人为松散堆积物来源及侵蚀状况调查的基础上 ,探讨了城市化建设开发造成的松散堆积物侵蚀与输移过程 ,指出松散堆积物由点源扩散—→线状输移—→集中汇聚 ,是延安市人为松散堆积物输移的主要过程。