Spatial assessment of hydrologic alteration across the Pearl River Delta, China, and possible underlying causes
Spatial assessment of hydrologic alteration across the Pearl River Delta, China, and possible underlying causes
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DOI：
10.1002/hyp.7268
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发表时间：
2009-05
影响因子：
3.2
通讯作者：
Qiang Zhang;Chong-yu Xu;Y. Chen;Tao Yang
中科院分区：
文献类型：
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作者：
Qiang Zhang;Chong-yu Xu;Y. Chen;Tao Yang
基于17个测量站的月水位数据，利用“变差范围法”（RVA）研究了珠江三角洲（PRD）的水位变化。采用制图方法对水位变化程度的空间格局进行了分析。结果表明：与月平均最高和最低水位相比，月平均最高和最低水位出现中高变化的站点较多；水位变化较大的河道主要分布在北纬22°30′′以北地区。珠江三角洲的水位变化是各种影响因素的结果。然而，由于广泛而密集的人类活动，特别是大规模的河沙疏浚和挖掘，地形的变化可能是造成实质性水文变化的主要原因之一。研究表明，以水位变化为特征的河道多为高、中强度挖沙河道。上游主要控制流量的马口站与三水站之间的流量变化率也影响了珠江三角洲的水位变化。本文的研究结果对水资源管理和人类更好地减轻环境变化下因水位变化引起的自然灾害具有重要意义。版权所有©2009 John Wiley & Sons， Ltd
The alterations of the water level across the Pearl River Delta (PRD) were investigated using a ‘range of variability approach’ (RVA) based on monthly water level datasets extracted from 17 gauging stations. A mapping method was used to illustrate the spatial patterns in the degrees of alteration of water levels. The results indicated that more stations showing moderate and high alterations in monthly mean maximum and minimum water levels when compared with monthly maximum and minimum water levels. River channels characterized by higher alterations of water levels were observed mainly in the regions north of 22° 30′N. Alterations of water levels across the PRD were a consequence of various influencing factors. However, changed hypsography due to extensive and intensive human activities, particularly the large‐scale dredging and excavation of the river sand, may be taken as one of the major causes for the substantial hydrologic alteration. This study indicated that the river channels characterized by altered water levels are mostly those characterized by highly and moderately intensive sand dredging. The changed ratio of the streamflow between Makou and Sanshui stations, the major upstream flow control stations, also influenced the water level alterations of the Pearl River delta. The results of this study will be of great significance in water resources management and better human mitigation of the natural hazards due to the altered water level under the changing environment. Copyright © 2009 John Wiley & Sons, Ltd.