With intensive detecting data, the observational characteristics of mesoscale weather system triggering heavy rainfall over the middle valleys of Changjiang River is analyzed.
利用多种加密观测资料，详细分析了长江中游一次暴雨中尺度天气系统的观测特征。
Groundwater flow system of Shanghai area is part of regional flow system of Yangtze River delta; however, it has its own characteristics due to special environment of estuarine delta.
上海地区地下水流系统是长江三角洲系统的一个子系统，但由于河口三角洲这一独特环境，使其独具特征。
The morphologic characteristics of tidal flat and ti dal creek system in the Huanghe River Delta was studied by fractal geometry method.
利用分形分维方法对黄河三角洲潮滩和潮沟的地貌特征进行了定量研究。
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