基于RS的湖岸带物理结构完整性评价方法——以查干湖为例

Assessment of the integrity of the physical structure in the lakeshore zone of Chagan Lake,China,Based on Remote Sensing

以查干湖流域为研究区,利用RS和GIS技术,基于水利部《河流(湖)健康评估指标、标准与方法 V1.0》并加以改进,以500m×1000m为评价基本单元,整个研究区共有315个物理结构基本评价单元,建立基于RS的湖岸带物理结构完整性评价体系,该评价体系由目标层、准则层和指标层构成,其中准则层由湖岸带状况、湖岸线发育率和湖泊萎缩率3项组成,指标层由地形坡度、植被覆盖率等8项指标构成。研究结果表明:38个监测点中,查干湖23个,新庙泡15个,基于RS物理结构评价结果分别为0.67—0.76和0.35—0.45,地面实测评价结果分别是0.64—0.77和0.35—0.55。两种评价方法结果一致,并表明查干湖的湖岸带物理结构健康状态属于健康,新庙泡则属于亚健康。

In this study, we propose a new physical structure integrity assessment method, using Chagan Lake, China, as the study area. The method is based on the improved ＂river （lake） health assessment index, standard and method of V1.0＂ of the Ministry of Water Resources. A 500 mx 1000 m grid was selected on the lakeshore zone as the basic evaluation unit. An evaluation system of lakeshore physical structural integrity was established with 315 evaluation units by romte sensing and geogragy information system technology. The system was composed of target layer, a criterion layer, and an indicator layer. The criterion layer was composed of lakeshore condition, shoreline development rate, and lake atrophy rate. The index layer was composed of slope, vegetation coverage rate, and water level change rate, in addition to 8 other indicators. For 23 sampling points in Chagan Lake and 13 monitoring points in Xinmiao Lake, the RS evaluation were 0.60-0.74 and 0.35- 0.52, respectively, while the field evaluation results were 0.64-0.77 and 0.35-0.55, respectively. The evaluation results were in good agreement with the two evaluation methods, and consistently indicated that the physical structural integrity of the lakeshore area of Chagan Lake was in a healthy state, while that of Xinmiao Lake was in a sub-healthy state.