Effect of Initial Soil Moisture on Wetting Pattern under Trickle Linear Source in Layered Soil

Section: Research Paper
Issue
Vol. 30 No. 1 (2025): Volume 30 Issue 1
Published
Mar 1, 2025
Pages
14-26

Abstract

Trickle irrigation is considered one of the main methods in field irrigation. Studying and understanding the moisture distribution pattern beneath the drip irrigation is of great importance to reduce deep percolation losses and the number of emitters. The current study aims to understand the effect of initial soil moisture on the wetting pattern and moisture distribution in layered soils under a linear drip source. The study included tests to monitor the advance of the wetting front during both the wetting phase and moisture redistribution phase over time and for a constant volume of added water using two types of soils, sandy loam and clay, for two conditions of layered soil (sandy loam over clay) and (clay over sandy loam). Water was added at two rates and two levels of initial moisture for each soil type were considered. Empirical equations were derived for estimating both the horizontal surface advance with determination coefficient of )R=0.979( and vertical advance under the trickle source with determination coefficient of ) R=0.979(. The results showed that the ratio of horizontal advance to vertical advance for the wetting front increases with an increase in cumulative infiltration in the layered soil (sandy loam over clay) whhile this ratio decreases with an increase in cumulative infiltration in layered soil (clay over sandy loam). It was also found that the ratio of horizontal advance to vertical advance decreases with an increase in the initial soil moisture of the upper layer and that vertical advance is greater in the case of high moisture compared to low soil moisture for the lowere layer. In addition, the vertical advance in the subsoil isidentical for all cases of initial moisture and water application rates in layered soil (clay over sandy loam) while there is a clear difference in the effect of moisture and water application rate in layered soil (sandy loam over clay).

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Authors

Yahya Farhan Alnane

Dams and Water Resources Engineering Department, Collage of Engineering, University of Mosul, Mosul, Iraq

HAQQI ISMAIL YASIN

Dams and Water Resources Engineering Department, Collage of Engineering, University of Mosul, Mosul, Iraq

Identifiers

https://doi.org/10.33899/rengj.2023.142001.1271
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How to Cite

[1]
Y. Farhan Alnane, يحيى, H. ISMAIL YASIN, and حقي, “Effect of Initial Soil Moisture on Wetting Pattern under Trickle Linear Source in Layered Soil”, AREJ, vol. 30, no. 1, pp. 14–26, Mar. 2025.
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