Abstract
Gunung Sewu’s karstic aquifer characteristic of fracture-fissure water conduit leads to pollution problem in the water resources. One main source of water used is the Baron Spring. This study aims to analyze the water quality of the Baron Spring toward the land use in the catchment area and provide recommendations for spatial planning and water management in certain area. This research used spatial analysis of GIS and water quality was analyzed by Pollution Index. The results showed that the Baron Spring was in a mild contaminated state with amount of TSS was 97,1 mg/L, bicarbonate 96 mg/L, total coliform 210 MPN/100ml, and total oil and fat 2 mg/L which have exceeded the water source quality standards. Those results are related with the land use in the catchment area where settlement is dense in the upstream, also because of the distribution of settlement and sinkhole in the middle-part of catchment. In coping with the contamination and pollution several strategies are urged to be designed and implemented. Strategies comprised by two approaches, socio-cultural and spatial approach. Each of the approaches is linked and should not be separated. Management of catchment including stakeholder involvement and spatial planning are essential to be considered.
Highlights
Karst landscape is well known for its uniqueness and typical features
Karst supplies 25% of water needs all over the globe (Ford & Williams, 2007) and higher precentage in the region with mostly karst area, its water supplies are provided by karst landscape
Geographic Information System (GIS) is a fruitful tools in building a strategic and efficient development plan spatially as well in karst area (Komac & Urbanc, 2012) Data used in GIS were land use, Underground River, and ponors and caves distribution and the images used were SPOT 6 to detect and verify the land use
Summary
Karst landscape is well known for its uniqueness and typical features. Processes and dynamics of this landscape are the main factors which make karst become different among other landscapes. The key process in karst landsacpe is the solution of the limestone. Limestone is relatively soluble compared to other rocks in the world. The dissolution creates mostly surface and subsurface features where water flows through the cracks and fissures all over the karst area (Bonacci, 1987; Milanovic, 2005). Complexity of karst area makes it affected by human activities (Burri, Castiglioni, Sauro, 1999). Karst supplies 25% of water needs all over the globe (Ford & Williams, 2007) and higher precentage in the region with mostly karst area, its water supplies are provided by karst landscape
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