Recent changes of water discharge and sediment load in the Zhujiang (Pearl River) Basin, China
Recent changes of water discharge and sediment load in the Zhujiang (Pearl River) Basin, China
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DOI：
10.1016/j.gloplacha.2007.04.003
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发表时间：
2008-02
影响因子：
3.9
通讯作者：
Shurong Zhang;Xixi Lu;D. Higgitt;C. Chen;Jingtai Han;Huiguo Sun
中科院分区：
文献类型：
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作者：
Shurong Zhang;Xixi Lu;D. Higgitt;C. Chen;Jingtai Han;Huiguo Sun
本文研究了珠江水沙流量时间序列的变化。对珠江干流9个站1950 -2004年的年径流量和输沙量序列进行了趋势检验（Mann-Kendall检验）和突变检验（Pettitt检验）。Mann-Kendall检验和Pettitt检验均表明珠江流域各站的径流量没有明显的趋势性或突变性。年径流量主要受降水量变化的影响，而珠江流域水库、大坝的修建对径流量的影响不大。但在西江、东江干流的部分站点，泥沙量呈明显减少趋势。自1990年代以来，更多的台站出现了显著下降的趋势。珠江泥沙的减少反映了流域内水库建设的影响。与此相反，柳江，西江的第二大支流，经历了一个显着的上移，可能是由于在喀斯特地区加剧的石漠化负荷在1991年左右。珠江口（不包括三角洲）的年输沙量由1957-1995年的80.4× 106 t减少到1996-2004年的54.0× 106 t。更具体地说，自1990年代初以来，泥沙量稳步下降，2004年约为90年代前平均水平的三分之一。随着三峡工程的进一步开发，特别是大藤峡水利枢纽的建成，以及流域绿化力度的加大，人类活动对珠江来水来沙的影响将进一步加大。
The paper is concerned with identifying changes in the time series of water and sediment discharge of the Zhujiang (Pearl River), China. The gradual trend test (Mann–Kendall test), and abrupt change test (Pettitt test), have been employed on annual water discharge and sediment load series (from the 1950s–2004) at nine stations in the main channels and main tributaries of the Zhujiang. Both the Mann–Kendall and Pettitt tests indicate that water discharge at all stations in the Zhujiang Basin showed no significant trend or abrupt shift. Annual water discharges are mainly influenced by precipitation variability, while the construction of reservoirs/dams in the Zhujiang Basin had little influence on water discharge. Sediment load, however, showed significant decreasing trends at some stations in the main channel of the Xijiang and Dongjiang. More stations have seen significantly decreasing trends since the 1990s. The decreasing sediment load in the Zhujiang reflects the impacts of reservoir construction in the basin. In contrast, the Liujiang, the second largest tributary of the Xijiang, has experienced a significant upward shift of sediment load around 1991 likely caused by exacerbated rock desertification in the karst regions. The annual sediment load from the Zhujiang (excluding the delta region) to the estuary has declined from 80.4×106t averaged for the period 1957–1995 to 54.0×106t for the period 1996–2004. More specifically, the sediment load declined steadily since the early 1990s so that in 2004 it was about one-third of the mean level of pre-90s. Water discharge and sediment load of the Zhujiang would be more affected by human activities in the future with the further reservoir developments, especially the completion of the Datengxia hydroelectric project, and an intensification of the afforestation policy in the drainage basin.