TITLE:
Evaluating Model Effectiveness for Soil Infiltration Attribute: Comparison of Green-Ampt, Horton and Modified Green-Ampt Infiltration Models
AUTHORS:
Mosammat Mustari Khanaum, Md. Saidul Borhan
KEYWORDS:
Infiltration, Groundwater Recharge, Green-Ampt, Horton Model, Modified Green-Ampt
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.11 No.2,
February
27,
2023
ABSTRACT: Soil infiltration is a very important concept in hydrology as well as irrigation, which plays a vital role in estimating surface
runoff and groundwater recharge. It is a complicated process that varies with numerous factors.
Accurate estimation of soil infiltration is required for future irrigation, and many other purposes. To estimate the infiltration process,
there are numerous models. The majority of them have some presumptions, a
unique calculation method, and some limitations. The purpose of the paper was to
assess the model’s performance for a similar hypothetical scenario involving soil
infiltration. It compared the infiltration rate, runoff rate, and incremental infiltration versus time for three different
infiltration models: the Green-Ampt model (GA), the Horton model and the Modified Green-Ampt (MGA) model.
A spreadsheet was used to calculate the Horton model, and HYDROL-INF (V 5.03) was
used to simulate the other two models. Among those three models, the MGA model outperformed those three
models, while the GA model produced greater infiltration rate
than rainfall, which was insensible. The study showed that the MGA model, which
provides useful infiltration predictions, outperformed the other two infiltration
models. Since the Horton model does not consider
ponding conditions, it is only applicable when the effective rainfall intensity
exceeds the final infiltration capacity. Moreover, the GA model’s initial infiltration
rate is irrational because it disregards the intensity of the rainfall. The results
of this study will assist in selecting the most accurate method for estimating soil
infiltration for agricultural purposes.