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在RS/GIS的支持下,采用地形图扫描矢量化法构建涨渡湖区域的数字高程模型(DEM),将DEM模型与涨渡湖区2003年的LANDSAT 7 TM遥感图像进行叠加分析,提取出不同湿地类型的平均高程。通过回归分析,建立起水位、淹没面积、容积的关系模型。结合试验区的农情状况和水利设施的排涝能力,对比分析出通江前后涨渡湖地区调蓄能力的变化:通江前湖区最大调蓄面积为38.75 km2,最大调蓄容量为1.644亿m3;通江后其最大可淹没面积为273 km2, 最大可调蓄容量为9亿m3。
With the support of RS / GIS, the digital elevation model (DEM) of the Zhangdu Lake area was constructed by topographic map scanning vectorization method. The DEM model was overlaid with the LANDSAT 7 TM remote sensing image in 2003 in the Zhangduhu Lake area to extract different Average elevation of wetland type. Through regression analysis, establish the relationship model of water level, submerged area and volume. According to the situation of agro-ecosystem in the experimental area and the drainage capacity of water conservancy facilities, the change of regulation and storage capacity in Zhangduhu area before and after Tongjiang River was compared and analyzed: the maximum storage area in Qianhu District of Tongjiang River was 38.75 km2 and the maximum storage capacity was 164.4 million m3 After the river, its maximum submerged area is 273 km2, and its maximum adjustable storage capacity is 900 million m3.