Abstract
Erosion-hazard assessment is an important aspect in the management of a river basin such as Siak River Basin, Riau Province, Indonesia. This study presents an application of fuzzy logic approach to develop erosion risk map based on geographic information system. Fuzzy logic is a computing approach based on “degrees of truth” rather than the usual “true or false” (1 or 0) Boolean logic on which the modern computer is based. The results of the erosion risk map were verified by using field measurements. The verification result shows that the parameter of soil-erodibility (K) indicates a good agreement with field measurement data. The classification of soil-erodibility (K) as the result of validation were: very low (0.0–0.1), medium (0.21-0.32), high (0.44-0.55) and very high (0.56-0.64). The results obtained from this study show that the erosion risk map of Siak River Basin were dominantly classified as medium level which cover about 68.54%. The other classifications were high and very low erosion level which cover about 28.84% and 2.61% respectively.
Highlights
Siak river region is one of the major rivers that is included in the national strategic river criteria (Minister Regulation No 04/PRT/M/2015)
The criteria of national strategic has the following parameters: a) the potential of water resources in the relevant river area is bigger or equal to 20% of the potential water-resource in the province; b) the number of resources sectors in the relevant-river basin is at least 16 sectors; and the number of population in the basin is at least 30% of the total province population; d) the negative impact due to the destructive force of water to economic growth resulting in economic losses is at least 1% of gross regional domestic product of the province
The Siak river basin is in the position between 1000 28'-1020 12' East Longitude and 0020'-1016' North Latitude
Summary
Siak river region is one of the major rivers that is included in the national strategic river criteria (Minister Regulation No 04/PRT/M/2015). If the land use change is allowed continuously, this activity will have many impacts on the water quality and quantity of the Siak River Basin, especially in the upper watershed (Tapung Basin). In addition to this problem, the impact of the land use changes contributed to the potential soil erosion. Applications of fuzzy-logic soft computing models (fuzzy logic) in water resource management efforts have been carried out in various countries, such as research on the fluctuation of groundwater flow simulation in India [2], the study of erosion by using GIS and fuzzy logic in Turkey [3], the study of optimal water network using fuzzy logic in Singapore [4], and the research about development of erosion risk map using fuzzy logic method in combination with geographic information system (GIS) [5]. The research results proved that the model provided an effective description of erosion-risk map
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