胡春宏, 张治昊, 张晓明. 维持黄河流域水沙平衡的调控指标阈值体系研究[J]. 水科学进展, 2023, 34(5): 647-659. DOI: 10.14042/j.cnki.32.1309.2023.05.001
引用本文: 胡春宏, 张治昊, 张晓明. 维持黄河流域水沙平衡的调控指标阈值体系研究[J]. 水科学进展, 2023, 34(5): 647-659. DOI: 10.14042/j.cnki.32.1309.2023.05.001
HU Chunhong, ZHANG Zhihao, ZHANG Xiaoming. Threshold system of regulation indicators for maintaining the runoff and sediment balance of the Yellow River basin[J]. Advances in Water Science, 2023, 34(5): 647-659. DOI: 10.14042/j.cnki.32.1309.2023.05.001
Citation: HU Chunhong, ZHANG Zhihao, ZHANG Xiaoming. Threshold system of regulation indicators for maintaining the runoff and sediment balance of the Yellow River basin[J]. Advances in Water Science, 2023, 34(5): 647-659. DOI: 10.14042/j.cnki.32.1309.2023.05.001

维持黄河流域水沙平衡的调控指标阈值体系研究

Threshold system of regulation indicators for maintaining the runoff and sediment balance of the Yellow River basin

  • 摘要: 推进黄河流域系统治理与黄河水沙协同调控是确保黄河长久安澜的关键。因受气候、生态、地形地貌和强人类活动等多系统耦合影响, 约束黄河水沙整体行为的分系统协调以及各单系统水沙关系协调的表征指标筛选及其阈值确定, 一直是治黄实践的难题。基于维持黄河全流域水沙平衡, 构建了黄土高原-干流河道-河口水沙协同调控三级指标阈值体系, 包括1个一级指标、8个二级指标和20个三级指标。结果表明: ①流域侵蚀防控指标阈值体系中, 60%的林草梯田覆盖率下可致产沙的次降水量阈值为57 mm; 可基本遏制流域产沙的林草有效覆盖率和梯田比阈值分别为60%和40%;淤地坝拦沙减蚀阈值为三级沟道控制率40%~50%。②河道水沙调控指标阈值体系中, 近期宁蒙河段平滩流量阈值约为2 000 m3/s, 远期黑山峡水库建成后宁蒙河段平滩流量阈值约为2 500 m3/s; 近期潼关高程调控阈值约为328 m, 远期古贤水库建成后潼关高程可冲刷下降至326 m左右; 下游河道平滩流量阈值约为4 000 m3/s。③考虑黄河三角洲淤蚀动态平衡, 河口稳定沙量阈值约为2.6亿t/a。

     

    Abstract: The long-term stability of the Yellow River basin depends on its systematic governance and the coordinated regulation of runoff and sediment. Factors maintaining the balance of runoff and sediment in the Yellow River include climate, ecology, topography, and significant human activities. Clarifying the boundaries of the subsystems that regulate the overall behavior of runoff and sediment, studying regulation indicators, and maintaining runoff balance are crucial for understanding the function of the river system. This study constructed a basin-channel-estuary coordinated regulation indicator threshold system to maintain the runoff and sediment balance of the Yellow River from a basin-wide perspective. The results showed a three-level threshold system for runoff and sediment regulation based on maintaining the balance throughout the basin. This system includes one primary indicator, eight secondary indicators, and twenty tertiary indicators. In the erosion prevention and control indicator threshold system at the basin level, the threshold value of secondary rainfall that can cause sediment production under 60% coverage of forest, grass, and terrace is 57 mm. The effective coverage rate of forest and grass, along with the threshold value of the terrace ratio that can control sediment production, is 60% and 40%, respectively. The sediment interception and erosion reduction threshold value for check dams is 40% to 50% of the third-level channel control rate. In the runoff and sediment regulation indicator threshold system at the channel level, the recent threshold value of bankfull discharge in the Ningxia-Inner Mongolia reach of Yellow River is about 2 000 m3/s, and the long-term threshold value after the completion of the Heishanxia Reservoir is approximately 2 500 m3/s. The recent elevation control threshold of Tongguan is around 328 m and may decrease to approximately 326 m due to erosion after the completion of the Guxian Reservoir. The threshold value of bankfull discharge in the lower reaches of the river channel is about 4 000 m3/s. Considering the dynamic balance of siltation and erosion in the Yellow River Delta, the threshold value of stable sediment discharge in the estuary is around 260 million t/a.

     

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