Based on geographical and hydrological characteristics of lakes in the middle and lower reaches of Yangtze River, this paper analyzes the factors restricting the sustainable utilization of lake resources, including th...Based on geographical and hydrological characteristics of lakes in the middle and lower reaches of Yangtze River, this paper analyzes the factors restricting the sustainable utilization of lake resources, including the conflict among agriculture water conservancy, and fishery, lake water pollution and eutrophication, lake siltation and swamping. The countermeasures and suggestions, such as improving the strategic status of lake harnessing, strengthening integrated management of lakes and their watershed, strengthening researches on lake environment and lake resources, are proposed to practice the sustainable utilization of lake resources.展开更多
The evaluation method, model and process for the flood and waterlogging disaster condition by GIS,RS and GPS technology and the method for setting up disaster condition database, dyke database and historical disaster ...The evaluation method, model and process for the flood and waterlogging disaster condition by GIS,RS and GPS technology and the method for setting up disaster condition database, dyke database and historical disaster damage database are presented. An index of flood damage degree(FDD) used to evaluate the relative degree of disaster loss and divide flood and waterlogging area is suggested. The value of flood damage degree can be calculated as follows :taking the various disaster losses of sample area in a base year as standard value and computing the ratios of various disaster loss values in different areas and years to the standard flood disaster loss values, then summing up the weighted ratios. The computed results are the value of flood damage degree in the every year. The macroscopic flood disaster distribution can be evaluated by the values of flood loss degree.展开更多
科学测度水生态韧性对长江流域韧性城市的建设至关重要。基于“抵抗-适应-恢复-转型”框架构建城市水生态韧性指标体系,以2011—2022年长江中游城市群26个地级市为例,运用熵权-逼近理想解排序法(Technique for Order Preference by Simi...科学测度水生态韧性对长江流域韧性城市的建设至关重要。基于“抵抗-适应-恢复-转型”框架构建城市水生态韧性指标体系,以2011—2022年长江中游城市群26个地级市为例,运用熵权-逼近理想解排序法(Technique for Order Preference by Similarity to Ideal Solution,TOPSIS)、核密度估计等定量测算水生态韧性水平,分析时空演进特征。之后,利用空间杜宾模型(Spatial Durbin Model,SDM)深入探索不同因素的影响差异。研究得到的主要结果为:(1)在研究期内,长江中游城市群水生态韧性水平有所提升,环长株潭城市群优势显著,武汉城市圈次之,环鄱阳湖城市群最低。(2)研究区水生态韧性形成了以长沙、武汉、南昌省会城市为核心并逐渐向外递减的“中心—外围”格局,多数城市于后期实现了层级跃迁,且空间差异呈收敛趋势,各城市水生态韧性趋于均衡化。(3)人口密度、经济发展水平、金融发展水平对水生态韧性的提升表现为抑制作用,科技创新投入水平对水生态韧性为正向促进作用。研究可为长江中游水生态保护提供参考,同时对其他区域的水生态韧性评价具有借鉴意义。展开更多
文摘Based on geographical and hydrological characteristics of lakes in the middle and lower reaches of Yangtze River, this paper analyzes the factors restricting the sustainable utilization of lake resources, including the conflict among agriculture water conservancy, and fishery, lake water pollution and eutrophication, lake siltation and swamping. The countermeasures and suggestions, such as improving the strategic status of lake harnessing, strengthening integrated management of lakes and their watershed, strengthening researches on lake environment and lake resources, are proposed to practice the sustainable utilization of lake resources.
文摘The evaluation method, model and process for the flood and waterlogging disaster condition by GIS,RS and GPS technology and the method for setting up disaster condition database, dyke database and historical disaster damage database are presented. An index of flood damage degree(FDD) used to evaluate the relative degree of disaster loss and divide flood and waterlogging area is suggested. The value of flood damage degree can be calculated as follows :taking the various disaster losses of sample area in a base year as standard value and computing the ratios of various disaster loss values in different areas and years to the standard flood disaster loss values, then summing up the weighted ratios. The computed results are the value of flood damage degree in the every year. The macroscopic flood disaster distribution can be evaluated by the values of flood loss degree.
文摘科学测度水生态韧性对长江流域韧性城市的建设至关重要。基于“抵抗-适应-恢复-转型”框架构建城市水生态韧性指标体系,以2011—2022年长江中游城市群26个地级市为例,运用熵权-逼近理想解排序法(Technique for Order Preference by Similarity to Ideal Solution,TOPSIS)、核密度估计等定量测算水生态韧性水平,分析时空演进特征。之后,利用空间杜宾模型(Spatial Durbin Model,SDM)深入探索不同因素的影响差异。研究得到的主要结果为:(1)在研究期内,长江中游城市群水生态韧性水平有所提升,环长株潭城市群优势显著,武汉城市圈次之,环鄱阳湖城市群最低。(2)研究区水生态韧性形成了以长沙、武汉、南昌省会城市为核心并逐渐向外递减的“中心—外围”格局,多数城市于后期实现了层级跃迁,且空间差异呈收敛趋势,各城市水生态韧性趋于均衡化。(3)人口密度、经济发展水平、金融发展水平对水生态韧性的提升表现为抑制作用,科技创新投入水平对水生态韧性为正向促进作用。研究可为长江中游水生态保护提供参考,同时对其他区域的水生态韧性评价具有借鉴意义。
