SEDIMENT FLUX INTO THE SEA AS INFLUENCED BY DIFFERENT WATER AND SEDIMENT SOURCES IN THE DRAINAGE BASIN: AN EXAMPLE FROM THE YELLOW RIVER, CHINA
SEDIMENT FLUX INTO THE SEA AS INFLUENCED BY DIFFERENT WATER AND SEDIMENT SOURCES IN THE DRAINAGE BASIN: AN EXAMPLE FROM THE YELLOW RIVER, CHINA
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发表时间：
2002
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通讯作者：
Xu Jiong
中科院分区：
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作者：
Xu Jiong
大型河流的水沙来源往往不同，对入海泥沙通量的贡献也不同。黄河入海泥沙通量占世界入海泥沙通量的很大一部分。长江流域可划分为4个主要水沙源区。入海泥沙通量与流域内不同源区的水沙密切相关，并建立了经验回归模型来表达这种关系。根据这一模型，细颗粒产沙区（FSA）每单位量的泥沙，有85%（年序列）或72%（事件序列）可以输运入海;而粗颗粒产沙区（CSA）每单位量的泥沙，只有21%（年序列）或34%（事件序列）可以输运入海。70年代以来，黄河入海泥沙量明显减少，这在很大程度上与细颗粒泥沙产地的土壤治理措施有关。将本研究模型与以往建立的黄河流域土壤治理措施减水减沙估算模型相结合，可对未来气候变化和人类活动引起的泥沙通量变化进行定量预测。
The runoff and sediment of large rivers usually come from different source areas, which make different contributions to the sediment flux into the sea. This has been studied with an example from the Yellow River in China, whose suspended sediment flux into the sea accounts for a large percentage of the total of the world. The drainage basin of this river can be divided into 4 major water and sediment source areas. The sediment flux into the sea is closely related to the water and sediment from the different source areas in the drainage basin and, accordingly, an empirical regression model has been established to express this relationship. According to this model, for each unit amount of sediment from the fine sediment producing area (FSA), 85% (for annual series) or 72% (for event series) can be transported into the sea; however, for the sediment from the coarse sediment producing area (CSA), only 21% (for annual series) or 34% (for event series) can be delivered to the sea. Since the 1970s, the Yellow River's sediment flux into the sea has declined markedly and this reduction can be attributed to a great degree to the soil control measures in the fine sediment producing area. Combining the model of this study and the previously established models for estimating the water and sediment reduction caused by soil control measures in the Yellow River basin, quantitative prediction may be made for the change of sediment flux caused by climate change and human activities in the future.