Comparison of Saturated Hydraulic Conductivity Methods for Sandy Loam Soil with Different Land Uses
Comparison of Saturated Hydraulic Conductivity Methods for Sandy Loam Soil with Different Land Uses
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DOI：
10.1007/978-981-13-2044-6_10
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
Aminul Islam;D. Mailapalli;Anuradha Behera
中科院分区：
文献类型：
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作者：
Aminul Islam;D. Mailapalli;Anuradha Behera
饱和导水率（Ks）是饱和土壤性质的定量测量，并且对于灌溉、排水和废水系统的设计、理解和预测渗透率、径流率、侵蚀率、渗流率、上升流率、溶质输运率以及污染物向地下水的迁移率的建模研究是必不可少的。然而，K的准确性在很大程度上取决于所使用的方法、土壤和表面特性。研究的目的是比较两种原位方法[双环入渗仪（DRI），空气入口渗透率（AEP）]和一种基于土壤传递函数（PTF）的方法在四种不同土地利用方式，如水田（PADF），芒果田（MANF），腰果田（CASF）和操场（PLAG）。利用DRI法、AEP法和PTF法计算的K值，研究了土地利用方式和方法对K值的影响以及方法对土地利用方式的适用性。结果表明，不同土地利用类型的AEP和DRI实测Ks数据均服从对数正态分布。不同测量技术和土地利用方式的K值差异显著。在所有土地利用中，AEP导致的Ks值最高（2.64 mm/h），PTF导致的Ks值最低（1.59 mm/h），而在CASF和PLAG土地利用中，Ks值分别最高（2.47 mm/h）和最低（1.75 mm/h）。对于所有的土地利用，平均KsAEP最高，其次是DRI，和PTF方法。各土地利用类型的K值依次为CASF（2.51 mm/h）、MANF（1.87 mm/h）、PADF（1.82 mm/h）和PLAG（1.71 mm/h）。DRI法和土地利用PLAG法观测到KS的空间变异性。为特定情况选择最合适的方法可以通过优化相互依赖的参数来获得，这些参数包括所使用的方法、仪器和测量方法的准确度、土壤条件和调查的实际限制的数量（例如，成本、可用人力、时间要求、估算的可移植性、测量技术的简单性、操作条件）。
Saturated hydraulic conductivity (Ks) is a quantitative measure of saturated soil properties and it is essential for designing irrigation, drainage and waste water systems, modelling studies for understanding and prediting rates of infiltration, runoff, erosion, seepage, upflux, solute transport and migration of pollutant to groundwater. However, the accuracy ofKsis highly dependent on the method used, soil and surface characteristics. The objective of the study was to compareKsmethods such as two in situ [Double ring infiltrometer (DRI), air entry permeameter (AEP)] and one pedotransfer function (PTF) based methods for four different land uses such as paddy field (PADF), mango field (MANF), cashew field (CASF) and playground (PLAG). TheKsobtained from the DRI, AEP and PTF methods were used to study the effect of the method and land use onKsand suitability of a method for a land use. It was observed that the measuredKsdata using AEP and DRI of different land uses follow a log-normal distribution. The meanKswere significantly different for both measuring technique and the land use. The AEP resulted highest (2.64 mm/h) and PTF lowest (1.59 mm/h) values ofKs, respectively for all land uses, whereas theKswas highest (2.47 mm/h) and lowest (1.75 mm/h) for the land uses CASF and PLAG, respectively. For all land uses, the meanKswere highest for AEP followed by DRI, and PTF methods. The order ofKsobtained for the land uses were CASF (2.51 mm/h), MANF (1.87 mm/h), PADF (1.82 mm/h) and PLAG (1.71 mm/h). Spatial variability ofKswas observed for DRI method and the land use PLAG. The selection of best suitable method for a particular situation can be obtained by optimizing the interdependent parameters, including method to be used, accuracy in instrument and measurement methods, soil condition and the numbers of practical constraints of the investigation (e.g., cost, availability of manpower, time requirement, portability of estimate, simplicity in measuring technique, operating condition).