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SWAT-based hydrological modelling of tropical land-use scenarios


Memarian, Hadi and Balasundram, Siva Kumar and Abbaspour, Karim C. and Talib, Jamal and Teh, Christopher Boon Sung and Mohd Sood, Alias (2014) SWAT-based hydrological modelling of tropical land-use scenarios. Hydrological Sciences Journal, 59 (10). pp. 1808-1829. ISSN 0262-6667; ESSN: 2150-3435


The Hulu Langat basin, a strategic watershed in Malaysia, has in recent decades been exposed to extensive changes in land-use and consequently hydrological conditions. In this work, the impact of Land Use and Cover Change (LUCC) on hydrological conditions (water discharge and sediment load) of the basin were investigated using the Soil and Water Assessment Tool (SWAT). Four land-use scenarios were defined for land-use change impact analysis, i.e. past, present (baseline), future and water conservation planning. The land-use maps, dated 1984, 1990, 1997 and 2002, were defined as the past scenarios for LUCC impact analysis. The present scenario was defined based on the 2006 land-use map. The 2020 land-use map was simulated using a cellular automata-Markov model and defined as the future scenario. Water conservation scenarios were produced based on guidelines published by Malaysia’s Department of Town and Country Planning and Department of Environment. Model calibration and uncertainty analysis was performed using the Sequential Uncertainty Fitting (SUFI-2) algorithm. The model robustness for water discharge simulation for the period 1997–2008 was good. However, due to uncertainties, mainly resulting from intense urban development in the basin, its robustness for sediment load simulation was only acceptable for the calibration period 1997–2004. The optimized model was run using different land-use maps over the periods 1997–2008 and 1997–2004 for water discharge and sediment load estimation, respectively. In comparison to the baseline scenario, SWAT simulation using the past and conservative scenarios showed significant reduction in monthly direct runoff and monthly sediment load, while SWAT simulation based on the future scenario showed significant increase in monthly direct runoff, monthly sediment load and groundwater recharge.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Agriculture
Faculty of Forestry
DOI Number: https://doi.org/10.1080/02626667.2014.892598
Publisher: Taylor & Francis
Keywords: LUCC; SWAT; Calibration; Uncertainty analysis; Hulu Langat basin; Malaysia
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 14 Jan 2016 04:59
Last Modified: 08 Aug 2017 05:38
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1080/02626667.2014.892598
URI: http://psasir.upm.edu.my/id/eprint/35554
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