砒砂岩分布范围界定与类型区划分

 以TM影像为主要信息源,采用“路线调查”和“典型小流域调查”相结合的方法,建立不同类型砒砂岩影像解译标志,在地理信息系统支持下,采用计算机辅助下的人工解译,对以晋陕蒙接壤地区为中心的砒砂岩分布范围进行全面界定,并将其划分为裸露砒砂岩区、盖土砒砂岩区和盖沙砒砂岩区3个类型区,确定每一类型区的分布范围及面积大小。结果表明:砒砂岩区总面积1.67万km2,其中,裸露砒砂岩区面积4543.89km2,盖沙砒砂岩区面积3709.18km2,盖土砒砂岩区面积8432.41km2,分别占砒砂岩区总面积的27.2%、22.2%、50.6%。准确划分砒砂岩区,为其全面治理及黄河粗泥沙来源区治理提供科学依据。

Definition of arsenic rock zone borderline and its classification

Taking the TM remote sensing data as the main information source, route survey and typical small watershed survey were used as the methods. Through massive field investigation, the image interpretion signs of different types of soft rock was established. With the supporting of geographic information system, by the meathod of computer assistanted artificial interpretion, the bordline of the soft rock was defined which mainly takes Shanxi, Shaanxi and Inner Mongolia contiguous area as its distribution center, and divided it into such three type areas as the exposed area, the loess covered area and the sand covered area. The distributive scope and the area size of each type have been determined. The result showed that the soft rock with the total area of 16700 km^2, of which exposed area 4 543.89 km^2, sand covered area 3 709.18 km^2, loess covered area 8 432.41 km^2, separately accounts for the total area 27.2%, 22.2% and 50.6%, areas of soft rock were defined.