Author(s): S. K. Sinnakaundan; R. Rainis; W. R. Ismail
Linked Author(s):
Keywords: Morgan; Morgan Finney Method; Sediment Yield; Embedded Model; GIS
Abstract: Morgan, Morgan & Finney (MMF) Method for predicting sediment yield has been successfully applied in various parts of Malaysia and Indonesia (Morgan, 1974, Morgan, 1979; Walsh, 1980; Morgan et al, 1982, Morgan, et al (1984), Besler, 1987, Brooks et al, 1993). However the spatial variability in the hydrological processes cannot be shown using these self structured procedures. To incorporate this spatial variation, a distributed NPP simulation model namely Ghydmod 1.0 that contains 3 major elements of the model (1: the mathematical equation that governs the hydrologic processes, 2: maps that define the study area, and 3: database tables that describes the information on a spatial variation and input parameters) integrated in one operating system. Arc View GIS 3.0a, ArcView Spatial Analyst, Avenue Scripting Language and Dialog Designer had been chosen to construct this model. Ghydmod 1.0 has been successfully used to estimate the impact of nine possible different land use development scenarios for existing and future conditions at three different locations in Kulim catchment area, Kedah, Peninsular Malaysia. The average discrepancy ratio between simulated and measured results is 1.1006 which falls within acceptable ratio range which is 0.5 to 2.0. Development on a newly cleared land was found to yield the highest sediment concentration (average 52.2% increase) however changes to urban areas do not have a significant increase in sediment yield (average 4.9 % increase). Introduction of the spatial element to the existing MMF method further enhance and provides a sustainable use for the existing procedure.
Year: 2003