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Remote Sens. 2011, 3(6), 1067-1087; doi:10.3390/rs3061067
Article

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

1,* , 2
 and
1
1 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 2 College of Engineering and Information Technology, Caraga State University, Ampayon,Butuan City 8600, Philippines
* Author to whom correspondence should be addressed.
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)
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Abstract

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.
Keywords: land-cover; hydrology; impact analysis; modelling; Landsat land-cover; hydrology; impact analysis; modelling; Landsat
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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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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