本文選題：降雨強度　切入點：徑流　出處：《泥沙研究》2017年06期

【摘要】：為了進一步明確黃土高原水平梯田邊坡在不同降雨強度下的侵蝕規(guī)律和細溝發(fā)育特征,選取陜西安塞縣紙坊溝小流域土壤為試驗材料,利用自制的試驗模型槽,采用人工分層填筑方法,模擬野外最常見的單級梯田形態(tài),在室內模擬降雨的條件下,設計了五組降雨強度(1.5、1.75、2.0、2.25、2.5 mm/min),研究了不同降雨強度對單級梯田的侵蝕規(guī)律和細溝發(fā)育的影響。結果表明:降雨強度對徑流率和侵蝕速率的變化有著顯著的影響,雨強≥2.0 mm/min時,徑流率和侵蝕速率呈波動性增加;梯田邊坡細溝長度、寬度和深度隨雨強的增大而增大,其中細溝的長度能很好地反映細溝的發(fā)育過程,且與侵蝕速率之間存在著極顯著的正相關關系;不同降雨強度下,梯田邊坡坡面流速均呈先增大后穩(wěn)定的趨勢,坡面平均流速和雨強呈明顯的冪函數(shù)關系;梯田邊坡在侵蝕分為片狀侵蝕、細溝侵蝕、細溝調整和崩塌四個階段,且土壤侵蝕量與雨強之間有著明顯的指數(shù)關系。
[Abstract]:In order to further clarify the erosion law and the characteristics of rill development of horizontal terraced slope in loess plateau under different rainfall intensity, the soil of Zhifanggou small watershed in Ansai County, Shaanxi Province was selected as the experimental material, and the self-made test model slot was used. The artificial stratified filling method is used to simulate the most common single-stage terraced fields in the field. Under the condition of indoor simulated rainfall, Five groups of rainfall intensity were designed, and the effects of different rainfall intensity on erosion law and rill development of single terrace were studied. The results showed that the rainfall intensity had significant influence on the change of runoff rate and erosion rate, and the rainfall intensity 鈮，

本文編號：1663272