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Open AccessArticle

Integrated Landsat Image Analysis and Hydrologic Modeling to Detect Impacts of 25-Year Land-Cover Change on Surface Runoff in a Philippine Watershed

Applied Geodesy and Space Technology Research Laboratory, The Training Center forApplied Geodesy and Photogrammetry, College of Engineering, University of the Philippines,Diliman, Quezon City 1101, Philippines
College of Engineering and Information Technology, Caraga State University, Ampayon,Butuan City 8600, Philippines
Author to whom correspondence should be addressed.
Remote Sens. 2011, 3(6), 1067-1087;
Received: 4 March 2011 / Revised: 4 May 2011 / Accepted: 6 May 2011 / Published: 26 May 2011
(This article belongs to the Special Issue 100 Years ISPRS - Advancing Remote Sensing Science)
Landsat MSS and ETM+ images were analyzed to detect 25-year land-cover change (1976–2001) in the critical Taguibo Watershed in Mindanao Island, Southern Philippines. This watershed has experienced historical modifications of its land-cover due to the presence of logging industries in the 1950s, and continuous deforestation due to illegal logging and slash-and-burn agriculture in the present time. To estimate the impacts of land-cover change on watershed runoff, land-cover information derived from the Landsat images was utilized to parameterize a GIS-based hydrologic model. The model was then calibrated with field-measured discharge data and used to simulate the responses of the watershed in its year 2001 and year 1976 land-cover conditions. The availability of land-cover information on the most recent state of the watershed from the Landsat ETM+ image made it possible to locate areas for rehabilitation such as barren and logged-over areas. We then created a “rehabilitated” land-cover condition map of the watershed (re-forestation of logged-over areas and agro-forestation of barren areas) and used it to parameterize the model and predict the runoff responses of the watershed. Model results showed that changes in land-cover from 1976 to 2001 were directly related to the significant increase in surface runoff. Runoff predictions showed that a full rehabilitation of the watershed, especially in barren and logged-over areas, will be likely to reduce the generation of a huge volume of runoff during rainfall events. The results of this study have demonstrated the usefulness of multi-temporal Landsat images in detecting land-cover change, in identifying areas for rehabilitation, and in evaluating rehabilitation strategies for management of tropical watersheds through its use in hydrologic modeling. View Full-Text
Keywords: land-cover; hydrology; impact analysis; modelling; Landsat land-cover; hydrology; impact analysis; modelling; Landsat
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Santillan, J.; Makinano, M.; Paringit, E. Integrated Landsat Image Analysis and Hydrologic Modeling to Detect Impacts of 25-Year Land-Cover Change on Surface Runoff in a Philippine Watershed. Remote Sens. 2011, 3, 1067-1087.

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