Modeling Solute Transport by DLA in Soils of Northeastern Egypt.

Summary, in English

Arid soils in Egypt display large variability in solute transport properties, causing problems in soil management. To characterize this variability, dye infiltration experiments were conducted on four plots representing three main soil types in northeastern Egypt. The plots represented both cultivated and uncultivated land use. The observed dye patterns displayed a large variability and especially the clay soils indicated a high degree of preferential flow. The loamy sand and sandy soils displayed a more uniform dye distribution indicating more homogeneous soil properties. The observed dye patterns were modeled using a diffusion limited aggregation (DLA) model. The DLA is a random walk model where model parameters can be optimized using genetic algorithms (GA). The DLA model reproduced the observed dye patterns for all soils in an excellent way. The best fit was obtained with a specific combination of directional random walk probabilities Pu, Pd, Pr, and Pl for each plot (correlation 0.97-0.99). To account for soil layers with different hydraulic properties a two layer DLA model was developed. For all plots the Pu (upward random walk probability) was higher for the upper more homogeneous soil layer. The overall results showed that spatial variability resulting from solute transport for the investigated soils can be modeled using a DLA approach.

• Author: Yasser Ahmed Hamed; Hiroshi Yasuda; Magnus Persson; Ronny Berndtsson; Xin-Ping Wang
• Department/s: Division of Water Resources Engineering; Centre for Advanced Middle Eastern Studies (CMES); MECW: The Middle East in the Contemporary World
• Publishing year: 2015
• Language: English
• Publication/Series: PLoS ONE
• Volume: 10
• Issue: 3
• Links: http://dx.doi.org/10.1371/journal.pone.0119943
• Document type: Journal article
• Publisher: Public Library of Science (PLoS)
• Topic: Other Social Sciences; Water Engineering
• Status: Published
• ISBN/ISSN/Other: ISSN: 1932-6203