Since 1990s,the spatial data warehouse technology has rapidly been developing, but due to the complexity of multi-dimensional analysis, extensive application of the spatial data warehouse technology is affected. In th...Since 1990s,the spatial data warehouse technology has rapidly been developing, but due to the complexity of multi-dimensional analysis, extensive application of the spatial data warehouse technology is affected. In the light of the characteristics of the flood control and disaster mitigation in the Yangtze river basin, it is proposed to design a scheme about the subjects and data distribution of the spatial data warehouse of the flood control and disaster mitigation in Yangtze river basin, i.e., to adopt a distributed scheme. The creation and development of the spatial data warehouse of the flood control and disaster mitigation in Yangtze river basin is presented .The necessity and urgency of establishing the spatial data warehouse is expounded from the viewpoint of the present situation being short of available information for the flood control and disaster mitigation in Yangtze river basin.展开更多
传统旱涝评估多从单一因素角度来研究,而忽略了下垫面的特性如农业用地对旱涝事件形成的影响。基于昌化江流域内20个气象站点1970—2019年逐日降雨数据,结合遥感提取的30 m DEM和遥感解译的土地利用数据,应用降水Z指数对流域内的旱涝等...传统旱涝评估多从单一因素角度来研究,而忽略了下垫面的特性如农业用地对旱涝事件形成的影响。基于昌化江流域内20个气象站点1970—2019年逐日降雨数据,结合遥感提取的30 m DEM和遥感解译的土地利用数据,应用降水Z指数对流域内的旱涝等级进行划分。运用下垫面数据修正分析结果,评估流域旱涝面积时空变化特征,分别划分流域的易旱、易涝区。结果表明:流域冬春季节干旱问题较其它季节突出,但整体上干旱面积呈明显下降趋势;流域内夏秋季雨涝问题较为严重,且总体雨涝面积呈上升趋势。全年干旱易发区与秋季雨涝易发区较为集中分布于流域下游;总体昌化江流域旱涝灾害有逐年缓解趋势。展开更多
文摘Since 1990s,the spatial data warehouse technology has rapidly been developing, but due to the complexity of multi-dimensional analysis, extensive application of the spatial data warehouse technology is affected. In the light of the characteristics of the flood control and disaster mitigation in the Yangtze river basin, it is proposed to design a scheme about the subjects and data distribution of the spatial data warehouse of the flood control and disaster mitigation in Yangtze river basin, i.e., to adopt a distributed scheme. The creation and development of the spatial data warehouse of the flood control and disaster mitigation in Yangtze river basin is presented .The necessity and urgency of establishing the spatial data warehouse is expounded from the viewpoint of the present situation being short of available information for the flood control and disaster mitigation in Yangtze river basin.
文摘传统旱涝评估多从单一因素角度来研究,而忽略了下垫面的特性如农业用地对旱涝事件形成的影响。基于昌化江流域内20个气象站点1970—2019年逐日降雨数据,结合遥感提取的30 m DEM和遥感解译的土地利用数据,应用降水Z指数对流域内的旱涝等级进行划分。运用下垫面数据修正分析结果,评估流域旱涝面积时空变化特征,分别划分流域的易旱、易涝区。结果表明:流域冬春季节干旱问题较其它季节突出,但整体上干旱面积呈明显下降趋势;流域内夏秋季雨涝问题较为严重,且总体雨涝面积呈上升趋势。全年干旱易发区与秋季雨涝易发区较为集中分布于流域下游;总体昌化江流域旱涝灾害有逐年缓解趋势。
