基于VFSMOD模型的黄土坡面生草带产流产沙动态模拟
发布时间：2018-11-07 21:53
【摘要】：利用微型径流小区和人工降雨试验,探讨运用VFSMOD模型评估和预测引入不同草种生草带后黄土坡面产流产沙动态特征的可行性。通过土壤物理性质参数和生草带生长状态参数的差异,模型还原了黄土坡面引入白三叶生草带与百脉根生草带后产流产沙特征的差异及其随生长时期的变化,模拟效果可靠,纳什系数:0.93(径流系数),0.98(修正后产沙量);归一化均方根误差:6.2%(径流系数),10.9%(修正后产沙量)。当生草带在降雨集中期(如本研究中百脉根草带9月上旬)不能保证较好的生长状态和地表覆盖时,其坡面产沙量急剧增大,且明显大于VFSMOD模型模拟值。在实际生草带设计时,应避免该情况发生。综上,VFSMOD模型适用于引入生草带后黄土坡面产流、产沙量的模拟和预测。
[Abstract]:The feasibility of using VFSMOD model to evaluate and predict the dynamic characteristics of sediment yield and sediment yield in loess slope after introducing different grass species into the loess slope was discussed by using micro-runoff plot and artificial rainfall experiment. Through the difference of soil physical property parameters and growth state parameters of grass growing zone, the model reduced the difference of the characteristics of abortion and sediment production after the introduction of white clover grass belt and Baimao root grass belt on the loess slope and its variation with the growth period, and the simulation effect was reliable. Nash coefficient: 0.93 (runoff coefficient), 0.98 (modified sediment yield); Normalized root mean square error: 6.2% (runoff coefficient), 10.9% (modified sediment yield). When the growth state and surface cover of the grass belt are not guaranteed in the rainfall concentration period (such as in the first ten days of September), the sediment yield on the slope increases sharply, and it is obviously larger than the simulated value of VFSMOD model. In the actual design of grass belt, this situation should be avoided. In summary, VFSMOD model is suitable for simulation and prediction of runoff and sediment yield on loess slope after the introduction of grass belt.
【作者单位】： 西北农林科技大学水土保持研究所;西北农林科技大学水利与建筑工程学院;
【基金】：国家自然科学基金(41571506、51579212) 国家重点研发计划(2016YFC0400204) 陕西省科技统筹创新工程项目(2015KTCL02-25、2016KTZDNY-01-03)
【分类号】：S157.4
，
本文编号：2317666
[Abstract]:The feasibility of using VFSMOD model to evaluate and predict the dynamic characteristics of sediment yield and sediment yield in loess slope after introducing different grass species into the loess slope was discussed by using micro-runoff plot and artificial rainfall experiment. Through the difference of soil physical property parameters and growth state parameters of grass growing zone, the model reduced the difference of the characteristics of abortion and sediment production after the introduction of white clover grass belt and Baimao root grass belt on the loess slope and its variation with the growth period, and the simulation effect was reliable. Nash coefficient: 0.93 (runoff coefficient), 0.98 (modified sediment yield); Normalized root mean square error: 6.2% (runoff coefficient), 10.9% (modified sediment yield). When the growth state and surface cover of the grass belt are not guaranteed in the rainfall concentration period (such as in the first ten days of September), the sediment yield on the slope increases sharply, and it is obviously larger than the simulated value of VFSMOD model. In the actual design of grass belt, this situation should be avoided. In summary, VFSMOD model is suitable for simulation and prediction of runoff and sediment yield on loess slope after the introduction of grass belt.
【作者单位】： 西北农林科技大学水土保持研究所;西北农林科技大学水利与建筑工程学院;
【基金】：国家自然科学基金(41571506、51579212) 国家重点研发计划(2016YFC0400204) 陕西省科技统筹创新工程项目(2015KTCL02-25、2016KTZDNY-01-03)
【分类号】：S157.4
，
本文编号：2317666
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