MODIFICATION AND PERFORMANCE EVALUATION OF A SMALL-SCALE RAINFALL SIMULATOR

International Journal of Agriculture, Environment and Bioresearch Pub Date : 1900-01-01 DOI:10.35410/ijaeb.2022.5736

M. O. Lasisi, F. F. Akinola, O. R. Ogunjimi

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Abstract

Rainfall simulator is an essential tool to simulate natural rainfall accurately and precisely. A reliable, accurate and portable small scale rainfall simulator is required for runoff, infiltration, sediment generation and erosion studies. And this has been used extensively to gather runoff, infiltration and erosion data in both laboratory and field experiments. This study was conducted to determine rainfall intensity, rainfall drop sizes and erosivity. An existing rainfall simulator was modified to be easily assembled, transported and maintained as well as to create a variety of rainfall regimes. Performance evaluation of the modified rainfall simulator was carried out with 10 trials to determine the intensity of rainfall, drop sizes and erosivity. Correlations were drawn out between the data of the simulated rainfall and that of the natural rainfall data. The results show that rainfall amount, intensity and kinetic energy are the main variables that influence rainfall erosivity index at 99% confidence level. The erosivity index of both simulated rainfall and natural rainfall are 36395.40JM-2mmhr-1 and 34792.51JM-2mmhr-1, respectively. The results of regression analysis of the simulated and natural rainfall show the influence of intensity and amount of rainfall on erosivity index. The linear regression models of simulated and natural rainfall show strong influence to varying degrees of (R2-values) which are 0.949, 0.190, 0.949 and 0.955, respectively. It was concluded that the modified rainfall simulator is suitable to simulate and reproduce natural rainfall characteristics such as rain drop size, intensity, kinetic energy and erosivity. The modified rainfall simulator is a portable type which can be easily assembled, maintained, transported and it can also be used in both laboratory and field experiments for irrigation, infiltration, runoff, sediment and erosion control studies. The estimated cost of modification was ₦44,520.00.

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小型降雨模拟器的改进与性能评价

降雨模拟器是准确、精确地模拟自然降雨的重要工具。径流、入渗、泥沙生成和侵蚀研究需要可靠、准确和便携的小尺度降雨模拟器。这已被广泛用于收集径流，渗透和侵蚀数据在实验室和现场实验。本研究旨在确定降雨强度、降雨量大小和侵蚀力。现有的降雨模拟器被修改为易于组装，运输和维护，以及创建各种降雨制度。对改进后的降雨模拟器进行了10次试验，以确定降雨强度、雨滴大小和侵蚀力。得出了模拟降水数据与自然降水数据之间的相关性。结果表明，在99%的置信水平上，降雨量、强度和动能是影响降雨侵蚀力指数的主要变量。模拟降雨和自然降雨的侵蚀指数分别为36395.40JM-2mmhr-1和34792.51JM-2mmhr-1。模拟降雨和自然降雨的回归分析结果表明，降雨强度和降雨量对侵蚀力指数有影响。模拟降雨和自然降雨的线性回归模型对(r2值)的影响程度不同，分别为0.949、0.190、0.949和0.955。结果表明，改进后的降雨模拟器能较好地模拟和再现自然降雨的雨滴大小、强度、动能和侵蚀力等特征。改进后的降雨模拟器是便携式的，易于组装、维护和运输，也可用于实验室和现场试验，用于灌溉、入渗、径流、泥沙和侵蚀控制研究。估计修改费用为44,520.00奈拉。

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International Journal of Agriculture, Environment and Bioresearch

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