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首页> 外文会议>International Yellow River Forum on Keeping Healthy Life of the River vol.4; 20051021-24; Zhengzhou(CN) >Changes in Flow and Sediment Regimes in the Yellow River
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Changes in Flow and Sediment Regimes in the Yellow River

机译：黄河流量和泥沙状况的变化。

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摘要

The paper is intended to summarize the changes in flow and sediment regimes in the Yellow River before and after the mid- 1980s and analyze the reasons for them. By the analysis of the measured data in the basin, we have come to realize striking features of the hydrologic regime changes. The river has been in low flow and sediment regimes since the mid - 1980s. Water volume and sediment load have become 40% less each since the mid -1980s than the average values over the long term at the hydrometrical stations in the stem river. Besides, distributions of flow and sediment in a year have changed significantly. The ratio of flow volume in the flood season to the total annual volume decreased from 60% to 40% . Frequencies of discharges more than 1,000 mVs have decreased so much that the problem of no flow has not been solved fundamentally. Frequencies of large floods occurring have decreased a lot while frequencies of small and middle floods with high concentrations have increased a lot. There will be still chances for large floods to happen in the Yellow River. Mean sediment particle size in the flood season has become smaller since the mid -1980s than before but the composition remains the same as before. If heavy rainfall comes, the mean particle size will become big just similar to that before the mid - 1980s. Reasons for the changes in flow and sediment regimes are investigated. The research results indicate that 23% of the change in flow regime and 39% of the change in sediment regime are caused by the changes in natural factors while the rests, 77% and 61%, are caused by human activities, respectively.
机译：本文旨在总结1980年代中期前后黄河水流和泥沙状况的变化，并分析其原因。通过对流域内实测数据的分析，我们已经认识到水文情势变化的显着特征。自1980年代中期以来，河流一直处于低流量和泥沙状态。自1980年代中期以来，水量和沉积物负荷比干河水位测量站的长期平均值平均低40％。此外，一年的流量和泥沙分布发生了显着变化。汛期流量与年总流量之比从60％降至40％。超过1000 mVs的放电频率已经降低了太多，以至于根本没有解决无流量的问题。发生大洪水的频率下降了很多，而发生高集中度的中小洪水的频率上升了很多。黄河仍然有可能发生大洪水。自-1980年代中期以来，汛期的平均沉积物粒径比以前小，但组成与以前相同。如果暴雨来临，平均粒径将变得与1980年代中期之前的粒径相似。研究了水流和泥沙状态变化的原因。研究结果表明，流态变化的23％和沉积物变化的39％是自然因素的变化，其余分别为77％和61％是人类活动的变化。

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