基于GIS加权叠加的南四湖流域地质环境质量评价

Geological environment quality evaluation of four lakes in southern Shandong Province based on GIS weighted superposition

南四湖是中国南水北调东线工程的重要输水储蓄枢纽,做好该流域地质环境质量评价工作对合理规划人类工程活动和保护生态环境具有重要意义。以南四湖上游流域为研究区,从地形地貌、构造活动性、地下水质量、土壤质量、地面沉降、崩塌滑坡、地面塌陷、人类工程活动强度8个方面,采用综合指数法并基于MapGIS软件进行分层加权叠加,然后根据分区阈值得到地质环境质量分区图,对地质环境进行综合评价。结果表明:该区地质环境质量总体较差,质量差和较差的面积占59.53%,质量好和较好的面积仅占40.47%;人类活动诱发地质灾害和水土污染是导致地质环境恶化的主要因素。地质环境质量分区评价结果对区内地质环境综合治理具有指导意义。

The four lakes in southern Shandong Province are an important water conveyance and storage hub for the eastern route of the South-to-North Water Diversion Project in China.Evaluating geological environment quality has significant meanings to planing human engineering activities and protecting the ecological environment.Taking the upper reaches of four lakes in southern Shandong Province as the research area,we evaluated the geological environment from 8 aspects,i.e.,topography and geomorphology,tectonic activity,groundwater quality,soil quality,ground subsidence,collapse and landslide,ground collapse,and intensity of human engineering activities.The comprehensive index method was used,and the layered weighted superposition was carried out based on the MapGIS software.The geological environment quality zoning map was obtained according to the zoning threshold.The results showed that the geological environment quality in this area was generally poor,59.53%of the area had poor quality,and only 40.47%of the areas was evaluated as good quality and better quality.Geological disasters and water(soil)pollution induced by human activities were the main factors leading to the deterioration of the geological environment.The zoning evaluation of geological environment quality has guiding significance to the comprehensive management of the geological environment in the area.