珠江三角洲河网区变化环境下的河床演变趋势和水文极端事件

Tendency of Fluvial Process and Hydrologic Extreme Events in River Network of Pearl River Delta under Changing Environment

珠江三角洲冲积平原河网密布,河道及河流的形态和演变影响着人们生活习性与经济发展水平,由于经济社会高速发展下的剧烈人类活动,以及气候、降水等自然环境的变化,导致河床演变加剧。对近60年的水文监测成果分析,发现自1990年代中期以来的河床演变,导致多种水文要素发生调整,给堤围险段、供水安全和水资源管理带来安全隐患,变化环境下的河流情势改变,是对当下水文工作的新挑战。

The alluvial plain of the Pearl River Delta is covered with river network.The morphology and evolution of channels affect people’s living habits and economic development level.With the rapid economic development,the fluvial process has been accelerated by intensive human activities,climate change,precipitation change and other natural environment change.Based on the analysis of the hydrologic monitoring results in the past 60 years,it is found that the fluvial process has leaded to variability of hydrological elements since the mid-1990s,which brings safety hazards of dangerous sections of embankments,water supply security and water resource management.The alteration of river hydrological regime has turned into the new challenge for hydrologic work.