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Hydrologic modeling, overland flow, erosion, catchment scale


Modeling overland flow and erosional behaviour is a very important scientific task today to prevent environmental impacts from human activities as well as physical disasters such as floods and desertification. In the particular project the impacts from selective logging that occurred in Malaysia has been attempted to identify and quantify by comparing hydrological parameters both in local and catchment scale. Measurements of rainfall, overland flow and suspended sediment flux have been recorded for a year with a resolution of five minutes. A Databased Mechanistic (DBM) modeling approach has been applied to the data to facilitate physical interpretation of the results, which provided credible conclusions. The significant alteration of the area’s hydrologic regime, due to human interventions, has become apparent. The great non- linearity of the rainfall-suspended sediment flux system reduced the efficiency of the models and did not allow reliable forecasting to be made. Nevertheless, useful conclusions has been drawn from the comparison of hydrologic parameters in different scales and should be emphasized that DBM models described very well the physical processes and provided satisfactory results.