Land cover change and water yield of Silang-Santa Rosa River subwatershed, Laguna, Philippines.

Date

2011

Abstract

Patterns of land cover changes in the Silang-Santa Rosa River Subwatershed were documented through conduct of Participatory Rural Appraisal approaches and GIS mapping. Drivers and impacts of land cover change in the upland, mid slope and lowland barangays of the subwatershed are influenced by local socioeconomic and biophysical conditions. 1993 and 2008 land cover maps were generated from classified satellite image using ArcGIS with four identified cover classes that include perennials and coconut, cultivated or tilled areas, fallow and grassland, and built-up. Land cover patterns in the subwatershed begun from perennials to grassland to built-up, and from farmlands to idle lands then to built-up. A GIS-based water balance model of the subwatershed that predicts water discharge was derived from PCRaster's Discharge Model with component parameters including rainfall, evapotranspiration, cover coefficient, and soil field capacity. Results of sensitivity analysis showed that the volume of water discharge changes with varying land cover coefficients. The model can be used to simulate various scenarios of land cover change and its impact to water yield. Simulation result show that increase in built-up areas resulted to increase in water yield implying reduction in groundwater recharge.

Document Type

Master Thesis

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 995 2011 E8 E54

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