DEM在低山丘陵区综合治理中的应用

Application of DEM on Comprehensive Harnessing of Hills and Mountainous Area

随着低山丘陵区水土流失日益严重,基于多角度、新方法的综合治理迫在眉睫。DEM模型能准确快速地反映区域的地形地貌特征,在低丘的治理中有着多层次的应用。笔者提出了应用DEM模型进行低山丘陵区气温和降水的空间模拟方法,划分区域作物优生区、适宜区的操作流程以及土地利用分区的确定,并把理论应用到小流域的具体实践中,数字化地形图建立样区的DEM模型,根据DEM数据监测样区内各种土地利用类型的坡度等级分布,提取坡度>25°的耕地,为小流域进一步的退耕还林做数据支持。实验结果表明:应用DEM模型能形象地表达区域的地形因子及流域特征,在低山丘陵区的综合治理中有广泛的应用前景。

With the aggravation of the soil and water conservation in the hills and mountains area, a multi-aspect and new-method comprehensive harnessing is needed badly. DEM model can express the features of area landform and physiognomy fleetly and truly, The authors bring forward the means of simulating lapse rate and precipitation spatially in the hills and mountains area, the operating flow of the measuring the crop genic and fitting partition and establishing of the land use sub-area. By digitizing the relief map, the DEM model is set up, the slope grade contribution of the different land use type in the sample area is finished and the crop landwhose slope is bigger than 25° is received , which can provide important data for converting land to forest small watershed. The research results illuminate that DEM model can describe the landform and character of the watershed, which can play an important role in the comprehensive harnessing in the hills and mountainous area.