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>Scenario Studies on Effects of Soil Infiltration Rates, Land Slope, and Furrow Irrigation Characteristics on Furrow Irrigation-Induced Erosion
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Scenario Studies on Effects of Soil Infiltration Rates, Land Slope, and Furrow Irrigation Characteristics on Furrow Irrigation-Induced Erosion
Furrow irrigation proceeds under several soil-water-furrow hydraulics interaction dynamics. The soil erosion consequences from such interactions in furrow irrigation in Samaru had remained uncertain. A furrow irrigation-induced erosion (FIIE) model was used to simulate the potential severity of soil erosion in irrigated furrows due to interactive effects of infiltration rates, land slope, and some furrow irrigation characteristics under different scenarios. The furrow irrigation characteristics considered were furrow lengths, widths, and stream sizes. The model itself was developed using the dimensional analysis approach. The scenarios studied were the interactive effects of furrow lengths, furrow widths, and slopes steepness; infiltration rates and furrow lengths; and stream sizes, furrow lengths, and slopes steepness on potential furrow irrigation-induced erosion, respectively. The severity of FIIE was found to relate somewhat linearly with slope and stream size, and inversely with furrow lengths and furrow width. The worst soil erosion (378.05 t/ha/yr) was found as a result of the interactive effects of 0.65 m furrow width, 50 m furrow length, and 0.25% slope steepness; and the least soil erosion (0.013 t/ha/yr) was induced by the combined effects of 0.5 l/s, 200 m furrow length, and 0.05% slope steepness. Evidently considering longer furrows in furrow irrigation designs would be a better alternative of averting excessive FIIE.
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机译：在几种土壤-水-沟水力相互作用的动力学条件下进行沟灌。在萨马鲁的沟灌中，这种相互作用对水土流失的影响仍然不确定。使用沟灌诱导侵蚀（FIIE）模型来模拟由于不同情况下的入渗率，坡度和某些沟灌特征的相互作用，在灌溉沟中土壤侵蚀的潜在严重性。所考虑的沟灌特征是沟长，宽度和溪流大小。该模型本身是使用尺寸分析方法开发的。研究的场景是犁沟长度，犁沟宽度和坡度陡度的相互作用。渗透率和犁沟长度;径流，沟长和坡度陡度分别对潜在的沟灌引起的侵蚀产生影响。发现FIIE的严重程度与坡度和溪流大小呈线性关系，与犁沟长度和犁沟宽度成反比。犁沟宽度为0.65 m，犁沟长度为50 m和坡度为0.25％的相互作用，发现了最严重的土壤侵蚀（378.05 t / ha / yr）。土壤侵蚀最小（0.013 t / ha / yr）是由0.5ll / s，200μm犁沟长度和0.05％坡度的综合作用引起的。显然，在沟灌溉设计中考虑更长的沟是避免过多FIIE的更好选择。
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