Assessment of soil water content in landslide-damaged upstream ecosystems using Soil and Water Assessment Tool (SWAT) model

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Alongkorn Wongmun
Sombat Chuenchooklin
Sittichai Choosumrong
๋Jaruntorn Boonyanuphap

Abstract

Soil water is very important for ups tream because plants used to grow up, affect to the
health and sustainability of the ecosystem. The severe landslide occurred in 2006 at the upstream
region of Maepoon sub-district might affect soil water holding capacity. This study aimed to assess
the soil water content in the ecosystem of upstream under normal condition and after landslide
condition (10 years ago) using Soil and Water Assessment Tool (SWAT) model. The SWAT model
was calibrated and subsequently the accepted values of R2, NSE and PBIAS were 0.58 0.48 and
8.91, respectively. The results from SWAT analysis showed highest soil water in October for the
entire area, particularly in low-slope areas. A rainfall retained in soil was approximately 5.15%
(10.91 million cu.m.). The available water capacity (AWC) of almost watershed (87.20 km2) was
39.55 million m3. The highest value of mean monthly soil water content was found in mixed
deciduous forest with bamboo with 180.82 mm, followed by mixed fruit tree-based agroforestry
(174.01 mm), mixed deciduous forest with bamboo after 10-year landslide (133.18 mm) and mixed
fruit tree-based agroforestry after 10-year landslide (129.34 mm), respectively. The comparison
of two ecosystems under normal condition and after 10-year landslide condition shows that soil
water content in landslide area was lower than normal condition. The results indicate that the
landslides can decrease soil water content in this region.

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