基于时空数据挖掘技术的华东区域暴雨时空特征

基于TRMM 3B42降雨数据,构建5个年尺度的时间序列参数,结合数据挖掘和GIS空间分析技术,分析2003—2015年中国华东区域暴雨时空特征.结果表明: 2003—2015年,研究区年降水量与年暴雨降水量空间分布较为相似,年降水总量呈略微上升的趋势,年暴雨降水比例的时间波动较显著;暴雨降水空间分布在南北方向的差异性明显强于东西方向;年暴雨频次的时间波动较小但空间差异显著;年暴雨降水呈现向北偏移的趋势;5个变量的变化趋势均表现出较强的空间差异性,且大部分像元呈不显著的增加(或减少)趋势.

Spatial-temporal dynamics of rainstorm in East China based on spatial-temporal data mining technology

Based on TRMM 3B42 precipitation data, 5 time series at annual scale were constructed. Then the spatial and temporal dynamics of rainstorm in East China region from 2003 to 2015 were evaluated in the support of data mining and GIS spatial analysis technology. The results showed that, the spatial distributions of annual precipitation and annual rainstorm precipitation were similar during 2003-2015. Annual precipitation exhibited a slight increase trend while annual rainstorm ratio showed significant fluctuation. The imbalanced distribution of rainstorm in latitudinal direction was more obvious than that of longitudinal direction. Annual rainstorm frequency changed smoothly with significant spatial difference. Rainstorm showed a tendency of moving to north in the past 13 years. The changing trends of the five variables showed significant spatial differences, and most pixels showed non-significant increasing (or decreasing) trends.