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Study on soil water retention and infiltration rate: a case study in eastern Iran
Environmental Earth Sciences ( IF 2.8 ) Pub Date : 2021-07-12 , DOI: 10.1007/s12665-021-09760-x
Saeedreza Moazeni-Noghondar 1 , Ali Golkarian 1 , Mahmood Azari 1 , Behnam Asgari Lajayer 2
Affiliation  

Knowing the water retention properties of soil can help with predicting water infiltration into the soil, the potential for runoff generation and sediment yield, and ultimately, better management of natural areas. The purpose of this study was to investigate the characteristics of the soil water retention curve (SWRC) and its effects on infiltration rate and runoff generation. For this purpose, an arid area in eastern Iran for which rainfall and runoff data were available was selected. Two variables that are assumed to affect soil water retention and runoff generation were used in this study, namely geological formation and topographic wetness index (TWI). The geological formations layer for the study area was extracted from 1:100,000 geological maps, and TWI was derived from the combination of slope and the area of upstream basins. Initial infiltration rate, stable infiltration rate, and time to stable infiltration rate were determined using the double ring infiltration apparatus and were used to create the soil infiltration potential curve (SIPC). In addition, saturation soil water content, field capacity, permanent wilting point, plant available water, and area under the curve were determined using pressure plates, and were used to create SWRC. The results showed that the characteristics of SWRC, SIPC, and soil water conditions after rainfall are affected by geological formation and TWI. All characteristics of SWRC were higher in the shale formation than the sandstone formation, and areas with higher TWI had lower soil water retention. Also, soils in the sandstone formation had higher initial and stable infiltration rates and required a shorter time to reach stable infiltration rates. The results showed that conversion of the soil water curve from the soil water-suction mode to the suction-time mode allows for predicting post-rainfall soil water conditions. Finally, areas in the shale formation with maximum TWI had the highest water retention potential, lowest infiltration rates, and maximum runoff generation capacity.



中文翻译:

土壤保水和入渗率研究:以伊朗东部为例

了解土壤的保水特性有助于预测水渗入土壤、产生径流和沉积物的潜力,并最终更好地管理自然区域。本研究的目的是研究土壤保水曲线(SWRC)的特征及其对入渗速率和产流的影响。为此,选择了伊朗东部的一个干旱地区,该地区可以获得降雨和径流数据。本研究使用了两个假设影响土壤保水和径流生成的变量,即地质构造和地形湿度指数 (TWI)。研究区地质构造层提取自1:100,000地质图,TWI由坡度与上游盆地面积相结合得到。使用双环入渗装置测定初始入渗速率、稳定入渗速率和达到稳定入渗速率的时间,并用于创建土壤入渗潜力曲线 (SIPC)。此外,饱和土壤含水量、田间持水量、永久枯萎点、植物有效水和曲线下面积使用压力板确定,并用于创建 SWRC。结果表明,降雨后SWRC、SIPC特征和土壤水分状况受地质构造和TWI的影响。页岩地层 SWRC 的所有特征均高于砂岩地层,TWI 较高的地区土壤保水率较低。还,砂岩地层中的土壤具有更高的初始和稳定入渗率,并且达到稳定入渗率所需的时间更短。结果表明,将土壤水分曲线从土壤吸水模式转换为吸水时间模式可以预测降雨后土壤水分状况。最后,具有最大 TWI 的页岩地层区域具有最高的保水潜力、最低的渗透率和最大的径流生成能力。

更新日期:2021-07-12
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