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为了全面考虑公路水土流失的影响因素并估算公路产沙量,从而为合理配置高速公路建设期水土流失治理措施提供依据,使用道路侵蚀模型SEDMODL2在西南喀斯特地区选取实例道路进行了水土流失估算,并使用USLE计算了路域背景水土流失量,对比分析了不同类型公路泥沙源的侵蚀强烈程度。研究结果表明,高速公路建设对路域范围内土壤侵蚀加剧作用明显(加速侵蚀率为3.65倍),公路施工范围内的加速侵蚀率为14.2倍,其中挖方坡施工所导致的水土流失最为严重(加速侵蚀率为21.4倍)。用于估算公路产沙的SEDMODL2模型原理明确、模型因子涵盖范围较广且量化过程简单,适合进行大范围的推广应用。
In order to comprehensively consider the influencing factors of highway soil erosion and estimate the sediment yield of highway, it provides the basis for rational allocation of soil and water loss control measures in expressway construction period. Using the road erosion model SEDMODL2, we select the example roads in Southwest Karst area to estimate soil erosion. Using USLE, the amount of soil and water loss in the road area was calculated, and the intensity of erosion on different types of highway sediment sources was comparatively analyzed. The results show that highway construction aggravates the aggravating of soil erosion in the road area (accelerating erosion rate is 3.65 times) and accelerating erosion rate in highway construction area is 14.2 times, of which excavation slope construction has the most serious soil erosion Accelerated erosion rate of 21.4 times). The SEDMODL2 model used to estimate highway sand production has a clear principle, a wide range of model factors and a simple quantitative process, which is suitable for a wide range of applications.