无地形资料地区电力工程内涝水位估算方法

Estimation Method of Inner Waterlogging Water Level for Power Engineering with No Topographic Data

随着新能源事业的快速发展,光伏和光热工程点也在迅速增多,特别是在光热资源较为丰富的内蒙古地区;但是受地方土地利用规划的限制,部分场区位于地势相对较低的区域,此时内涝积水成为影响工程布局及工程造价的重要限制条件。同时,当低洼地区的范围较大时,用常规测量方法进行地形测量及内涝积水的分析会造成工程前期成本的大幅增加,甚至导致工期的延长。本文选择了以DEM数据为基础,应用Arcgis软件分析区域内涝积水的方法,再辅以现场实测校核点对所得内涝水位进行校准,在满足工程要求的前提下极大减小了测量投入和工程工期;可以为低洼地区电力工程内涝积水的分析计算提供一定的参考。根据本文分析,当工程所在区域地势对比较大时计算结果可以达到较高的精度。但同时也需要指出,最终内涝水位在一定程度上受高程校核精度的影响,并且较低设计频率的内涝水位以及地势平坦地区内涝水位的模拟结果精度相对较差,在工程应用中需要予以注意。

With the rapid development of new energy industry, photovoltaic and solar thermal engineering sites are also increasing rapidly, especially in Inner Mongolia region where the light and heat resources were more abundant. But limitted by the local land use planning, the sites are always located in low area. Then water-logging can affect the cost and layout of the project. When the low-lying area is large, conventional measurement methods for analysis and topographic survey would increase rapidly, even extension of time limit. With DEM data as the basis, using Arc GIS software and elevation calibration, this method can satisfythe requirements of the project and greatly decrease the measurement inputs and the project duration, will provide reference for water logging analysis and calculation of low-lying land area electric power engineering. According to the analysis of this paper, when the project is located in the area with large terrain,the result can achieve a higher accuracy. But the accuracy is affected by elevation calibration precision to a certain extentand result accuracyof low frequency design of water level and sites in flat area is relatively poor.