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Assessment of impacts of land use changes on surface water using L-THIA model (case study: Zayandehrud river basin)

Assessment of impacts of land use changes on surface water using L-THIA model (case study: Zayandehrud river basin)

Assessment of impacts of land use changes on surface water using L-THIA model (case study: Zayandehrud river basin)

Abstract Land use changes in a basin are the most

important factors affecting its hydrology and water quality.

A hydrological model is an effective tool in

assessing the effects of land use change on surface

water. In this study, the effects of land use changes in

the Zayandehrud basin are estimated using long-term

hydrologic impact assessment model. This model is

applicable using long-term data on climate, soil hydrological

groups, and land use maps. The study covered

three land uses across 18 years (from 1997 to 2015), and

we used data on 30 years of precipitation (from 1985 to

2015) in the model. The results of modeling revealed

that the average runoff volume increased from around

5,765,034 m3 in 1997 to 8,894,525 m3 in 2015. The

results also showed an increase in runoff depth. Land

use changes over the study period showed an increase of

residential areas, bare land, and agricultural lands and a

decrease of pasture and forests. The results can be used

to make decisions and monitor changes in land use to

control the depth and volume of runoff. Using output

maps helps in delimitation of the areas that have high

runoff average and in implementation of the management

plans for controlling the amount of runoff in these

areas. Appropriate land use design can decrease impacts

of land use changes including hydrologic effects.

Keywords

 Landuse changes ,Zayandehrud river basin ,

Hydrological modeling , L-THIA model




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