DENG Jingcheng,GAO Peng,MU Xingmin,et al.Study on Calibrating Parameters of SCS Model in Loess Area Under Simulated Rainfall[J].Research of Soil and Water Conservation,2018,25(05):205-210.
模拟降雨条件下黄土区SCS模型的参数率定
- Title:
- Study on Calibrating Parameters of SCS Model in Loess Area Under Simulated Rainfall
- 分类号:
- S715.55
- 摘要:
- 开展径流模拟的相关研究，是进行土壤侵蚀预报和水土流失防治的重要基础。SCS模型是较为常用的一种径流计算模型。模型中的两个参数初损率λ和径流曲线数CN对于模型准确计算地表径流有重要意义。通过对杨青川流域22场不同土地利用类型人工模拟降雨资料，应用穷举法对该地区运用SCS模型时初损率和径流曲线数进行了率定。结果表明：（1）在黄土区，运用标准SCS模型模拟人工降雨条件下的径流深有较大误差，且模拟值均偏小1.1~3 mm。（2）初损率λ和径流曲线数CN都是模型的敏感性参数，且λ值敏感性更高。（3）运用穷举法的方式进行了各参数的率定后，得到在草地类型，SCS模型最适宜的初损率为0.13，径流曲线数为65；裸地类型最适宜的初损率为0.03，径流曲线数为83。优化后的模型能更好地模拟径流深，均方根误差、相对误差均显著减小，纳什系数有显著增大，能为该地区关于地表径流的模拟计算提供理论参考，具有重要意义。
- Abstract:
- The study on runoff simulation is an important basis for the prediction and control of soil and water losses and soil erosion. The SCS model is a commonly used model of runoff calculation. The two parameters in the model, initial loss rates λ and runoff curve number CN, are important for the model to calculate the surface runoff accurately. By artificial simulated rainfall data of 22 different land use types in Yangqingchuan river basin, the initial loss rate and runoff curve number of the SCS model in this area were verified by using the method of exhaustion. The results show that:(1) the simulated runoff depth by SCS model under artificial rainfall is very large, and the simulation value is 1.1~3 mm larger than the measured value in the loess area; (2) the initial loss rate and the runoff curve number are the sensitivity parameters of the model and the sensitivity of λ is higher. (3) the optimal initial loss rate was 0.13, and the runoff curve number was 65 in the grassland; the optimum initial loss rate is 0.03, and the runoff curve is 83 in the bare land. The optimized model can better simulate the depth of runoff, RMSE and Re decrease significantly, and the Nash coefficient increases significantly.
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备注/Memo
收稿日期:2017-10-25;改回日期:2017-11-18。
基金项目:十三五国家重点研发计划“黄土高原水土流失综合治理技术及示范”（2016YFC0501707）；中国科学院西部之光一般面上项目“延河流域水保措施抵御极端灾害性暴雨能力的研究”；国家自然科学基金面上项目“渭河流域水土流失对土地利用/覆被变化的尺度响应与模拟研究”（41371277）
作者简介:邓景成(1993-),男,山西大同人,硕士研究生,研究方向为流域生态水文和水土保持。E-mail:djc18821714915@163.com
通讯作者:高鹏(1976-),男,陕西宝鸡人,博士,副研究员,硕士生导师,主要从事水土保持和流域生态水文。E-mail:gaopeng@ms.iswc.ac.cn