Changing properties of precipitation concentration in the Pearl River basin, China
Changing properties of precipitation concentration in the Pearl River basin, China
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DOI：
10.1007/s00477-008-0225-7
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发表时间：
2009-03
影响因子：
4.2
通讯作者：
Qiang Zhang;Chong-yu Xu;M. Gemmer;Y. Chen;Chunling Liu
中科院分区：
文献类型：
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作者：
Qiang Zhang;Chong-yu Xu;M. Gemmer;Y. Chen;Chunling Liu
利用珠江流域42个雨量站1960-2005年逐日降水资料，分析了珠江流域降水集中度及其空间分布特征。确定了降水集中指数（CI）变化特征不同的区域。珠江流域西南部和东北部降水CI值较低且呈下降趋势，西北部和南部降水CI值较高且呈上升趋势。西、东江流域降水量CI较高，但呈下降趋势。对比1990年前后的降水CI变化趋势表明，珠江流域大部分地区在1990年以后降水CI呈增加的趋势。与1990年以前的降水CI变化相比，1990年以后的降水CI仅在桂河下游和郁江下游的少数站点出现下降。1990年后，西江、北江下游和北盘江上游的降水量CI显著增加。珠江流域降水CI的这些变化可能与全球变暖的后果有关。研究结果可为珠江流域水资源管理和生态环境保护提供参考。
In this paper, precipitation concentrations across the Pearl River basin and the associated spatial patterns are analyzed based on daily precipitation data of 42 rain gauging stations during the period 1960–2005. Regions characterized by the different changing properties of precipitation concentration index (CI) are identified. The southwest and northeast parts of the Pearl River basin are characterized by lower and decreasing precipitation CI; the northwest and south parts of the study river basin show higher and increasing precipitation CI. Higher but decreasing precipitations CI are found in the West and East River basin. Comparison of precipitation CI trends before and after 1990 shows that most parts of the Pearl River basin are characterized by increasing precipitation CI after 1990. Decreasing precipitation CI after 1990 (compared to precipitation CI changes before 1990) is observed only in a few stations located in the lower Gui River and the lower Yu River. Significant increasing precipitation CI after 1990 is detected in the West River, lower North River and upper Beipan River. These changes of precipitation CI in the Pearl River basin are likely to be associated with the consequences of the well-evidenced global warming. These findings can contribute to basin-scale water resource management and conservation of ecological environment in the Pearl River basin.