Flowsand moving patterns in semi-arid ad semi-humid region—A case study from Yucheng City of Shandong Province

Taking Yucheng City，Shandong Province as an example,the reasons and the characteristics of flowsand moving and the harms to the agricultural production in semi-arid and semi-humid areas are analyzed．The flowsand moving patterns are approached．The resuits provide scientific basis for controlling fiowsand and establishing agro-ecological system．