从自然地理背景宏观判析黄河中游粗泥沙集中来源区

Macro Analysis on Coarse Sand Concentrated Coming Area Based on Background of Physical Geography

为在黄河中游多沙粗沙区确定粗泥沙集中来源区,从黄河中游多沙粗沙区地质构造、地层岩性、地貌类型、水文气象等因素与产粗泥沙关系的区域差异对粗泥沙集中来源区进行了宏观判析,认为在黄河中游多沙粗沙区范围内,吴旗—志丹—延安—延长一线以北、东胜—准格尔—清水河一线以南、吴旗—榆林—神木—大柳塔一线以东(风沙区以东)至晋西北黄河沿岸的范围是侵蚀最为严重的地区,也是粗泥沙集中来源区的宏观待选范围。

In order to draw a circle around coarse sand concentrated coming area in sediment-laden and coarse sand area of the middle Yellow River,the paper makes macro analysis on the factors of geological structure,lithology of stratum,category of landforms and hydrometeorology of the sediment-laden and coarse sand area in the middle Yellow River and regional difference related with coarse sand production.It deems that the region to the north of Wuqi-Zhidan-Yan'an-Yanchang,to the south of Dongsheng-Zhun'ger-Qingshuihe,to the east of Wuqi-Yulin-Shenmu-Daliuta(east of windy and dusty area) and to the Yellow River in the northwestern Shanxi is the most severe erosion area and also a coarse sand concentrated coming area to be selected in a macro point of view in the scope of coarse sand region of the middle Yellow River.