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      南方红壤区抽水蓄能电站施工期水土流失分区管理方法研究

      Management methods and countermeasures of soil and water loss zoning during construction period of pumped storage power station in red soil area of southern China

      • 摘要: 南方山地丘陵地带地形复杂、红壤区降雨侵蚀力高, 高强度施工扰动会加剧水土流失风险。为降低抽水蓄能电站施工期水土流失对区域生态安全构成的威胁, 依托南方红壤区云浮水源山抽水蓄能电站施工期水土流失治理方案, 提出一套基于自然-工程-管理多要素的水土流失分区管理方法, 构建包含地形坡度、降雨侵蚀力、施工扰动强度等指标的评估体系, 并结合土壤流失方程RUSLE与GIS空间分析技术实现动态风险模拟。该抽水蓄能电站历经两个雨季后的监测结果表明:极高风险区、高风险区水土流失侵蚀模数降幅大多超过95%, 所有区域植被恢复周期缩短至1.5~2.0 a, 验证了分区管理在控制水土流失、促进生态恢复中的显著成效。研究成果可为类似工程提供参考。

         

        Abstract: The complex terrain of the southern mountainous and hilly areas, the high rainfall erosion capacity of the red soil area and the high intensity of construction disturbance have aggravated the risk of soil erosion. In order to reduce the threat of soil erosion during the construction period of pumped storage power station to regional ecological security, a set of soil erosion zoning management method based on natural-engineering-management multi-element was proposed by relying on the implementation of zoning management of Yunfu Shuanshan Pumped Storage Power Station in the southern red soil area. This paper constructed an evaluation system including topographic slope, rainfall erosion force, construction disturbance intensity and so on, and combined the Revised Universal Soil Loss Equation (RUSLE) and GIS spatial analysis technology to realize dynamic risk simulation. The results of two rainy seasons of the pumped storage power plant showed that most of the erosion modulus of the high-risk area and very high-risk area had decreased by more than 95%, and all of the cycle of vegetation restoration had been shortened to 1.5 to 2.0 years, which verified the significant effect of zoning management in controlling soil erosion and promoting ecological restoration. This paper discussed in detail the soil erosion zoning management methods and countermeasures, which could provide a reference for pumped storage power plant projects to enhance ecological safety.

         

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