Keywords
land use
salinity pattern
Semarang Coastal City
How to Cite
Abstract
Semarang Coastal City is one of cities in Indonesia which has experienced a long-term salt intrusion. Land subsidence and groundwater exploitation were identified as main factors accelerated salt intrusion in this area. Extended salt intrusion into the land from year to year cannot be neglected. Salinity pattern and land use affected by this intrusion must be identified. Salinity pattern could be identified by electrical conductance content. The purposes of this research are: a) to define spatial electrical conductance map from 1995 to 2008 and b) to identify salinity pattern in each land use. Primary data set of electrical conductance measurement in 2004 and 2008 was performed. Secondary data set of electrical conductance was collected in 1995 and 2000. Electrical conductance mapping was assigned by point interpolation using GIS Environment. Land use classification was interpreted from topographical map and IKONOS using GIS Environment. Field check of land use was also done in the study area. Geologically, the area setting consists of Damar, Kalibiuk, and Breccias Formations, where the Damar Formation is the recharge source for groundwater in Semarang City. Based on the result, it can be concluded that the salinity content in groundwater increased from 1995-2008. In 1995, there was only 2.4% of brackish groundwater in Semarang Coastal City, but in 2008, most of area in that region was classified as saline. Land use conversion into built up area increased from 1998 to 2008. The area intruded by salt water increased within 1995, 2004, and 2008 periods. About 68 % of the area contained brackish water and most of the area were built up area in 1995. In 2004, no fresh groundwater found in Semarang Coastal City and the area of brackish groundwater reached 77% and about 23% was saline groundwater which 82% of the built up area included brackish groundwater. In 2008, approximately 55% of Semarang Coastal City was occupied by saline groundwater. About 51% of groundwater built up area was saline.
References
Badan Pusat Statistik (BPS) Kota Semarang, 2012. Semarang Municipality in Figure 2011. BPS Kota Semarang, Indonesia.
Baird, A.J. and Horn, D.P., 1996. Monitoring and Modelling Groundwater Behaviour in Sandy Beaches. Journal of Coastal Research, 12(3), p.630-640.
Bennetts, D.A., Webb, J.A., Stone, D.J.M., and Hill, D.M., 2006. Understanding the Salinisation Process for Groundwater in an Area of South-Eastern Australia, using Hydrochemical and Isotopic Evidence. Journal of Hydrology , 323, p.178-192.
Chalabi, A., Mohd-Lokman, H., Mohd-Suffian, I., Karamali, K., Karthigeyan, V., and Masita, M., 2006. Monitoring shoreline change using IKONOS image and aerial photographs: a case study of Kuala Terengganu area, Malaysia. ISPRS Commission VII Mid-term Symposium “Remote Sensing: From Pixels to Processes”, Enschede, the Netherlands, p.8-11.
Cho, J., Barone, V.A., and Mostaghimi, S., 2009. Simulation of Land Use Impacts on Groundwater Levels and Streamflow in a Virginia Watershed. Agricultural Water Management, 96, p.1-11.
Datema, C., 1989. Groundwater Flow Systems in the Northern Coastal Lowlands of West- and Central Java, Indonesia (An Earth-Scientific Approach), Kanisius, Yogyakarta, Indonesia.
Hara, Y., Takeuchi, K., and Okubo, S., 2005. Urbanization Linked with Past Agricultural Land Use Patterns in the Urban Fringe of a Deltaic Asian Mega-city: A Case Study in Bangkok. Landscape and Urban Planning, 73, p.16-28.
Hasan, M.A., Bhattacharya, P., Sracek, O., Ahmed, K.M., von Brömssen, M., and Jacks, G., 2009. Geological Controls on Groundwater Chemistry and Arsenic Mobilization: Hydrogeochemical Study along an E-W Transect in the Meghna Basin, Bangladesh. Journal of Hydrology, 378, p.105-118.
Hugget, R.J., 2007. Fundamentals of Geomorphology. Second Edition, Routledge, New York, 503pp.
Jeong, C.H., 2001. Effect of Land Use and Urbanization on Hydrogeochemistry and Contamination of Groundwater from Taejon Area, Korea. Journal of Hydrology, 253, p.194-201.
Kuehn, F., Albiol, D., Cooksley, G., Daro, J., Granda, J., Haas, S., Hoffmann, R., and Murdohardono, D., 2010. Detection of Land Subsidence in Semarang, Indonesia, Using Stable Points Network (SPN) Technique. Environmental Earth Sciences, 60, p.909-921. DOI: 10.1007/s12665-009-0227-x
LaFleur, R.G., 1999. Geomorphic Aspects of Groundwater Flow. Hydrogeology Journal, 7(1), p.78-93.
Lenahan, M.J. and Bristow, K.L., 2010. Understanding Sub-Surface Solute Distributions and Salinization Mechanisms in a Tropical Coastal Floodplain Groundwater System. Journal of Hydrology, 390, p.131-142. DOI:10.1016/j.jhydrol.2010.06.009
Lerner, D.N. and Harris, B., 2009.The relationship between land use and groundwater resources and quality. Land Use Policy, 26(1), p.S265-S273. https://dx.doi.org/10.1016/j.landusepol.2009.09.005
Marfai, M.A. and King, L., 2007. Monitoring Land Subsidence in Semarang, Indonesia. Environmental Geology, 53, p.651-659, Springer-Verlag. DOI: 10.1007/s00254-007-0680-3
Marfai, M.A. and King, L., 2008. Potential Vulnerability Implications of Coastal Inundation due to Sea Level Rise for the Coastal Zone of Semarang City, Indonesia. Environmental Geology, 54, p.1235-1245. DOI: 10.1007/s00254-007-0906-4
Marfai, M.A., Almohammad, H., Dey, S., Susanto, B., and King, L., 2008, Coastal Dynamic and Shoreline Mapping: Multi-Sources Spatial Data Analysis in Semarang Indonesia, Environmental Monitoring and Assessment, 142(1-3), p.297-308. DOI: 10.1007/s10661-007-9929-2
Perry, E., Paytan, A., Pedersen, B., and Guadalupe, Velazquez-Oliman, G., 2009. Groundwater Geochemistry of the Yucatan Peninsula, Mexico: Constraints on Stratigraphy and Hydrogeology. Journal of Hydrology, 367, p.27-40. DOI:10.1016/j.jhydrol.2008.12.026
Poole, G.C., 2010. Stream Hydrogeomorphology as a Physical Science Basis for Advances in Stream Ecology. Journal of the North American Benthological Society, 29(1), p.12-25. The Society for Freshwater Science.
Purnama, Ig. L. S., 2005. Distribusi Air Asin dalam Tanah Dataran Pantai: Studi Kasus di Kota Semarang. PhD Thesis, Faculty of Geography, Universitas Gadjah Mada, Yogyakarta, Indonesia.
Rahmawati, N., 2010. Groundwater Zoning as Spatial Planning in Semarang City. Delta Competition 2010 Report (Innovative Solutions for the Delta: Innovative Ideas for Deltas Cities to Respond to Climate Change Challenges in the Complex Urban Environment). Delta Alliance and Royal Haskoning, Rotterdam, The Netherlands.
Stisen, S., Jensen, K.H., Sandholt, I., and Grimes, D.I.F., 2008. A remote sensing driven distributed hydrological model of the Senegal River basin. Journal of Hydrology, 354, p.131-148.
Summerell, G.K.. Tuteja, N.K., Grayson, R.B., Hairsine, P.B., and Leaney, F., 2006. Contrasting Mechanisms of Salt Delivery to the Stream from Three Different Landfoms in South Eastern Australia. Journal of Hydrology, 330, p.681-697, DOI:10.1016/j.jhydrol.2006.05.002
Thanden, R.E., Sumadirja, H., Richards, P.W., Sutisna, K., and Amin, T.C., 1996. Geological Map of the Magelang and Semarang Sheets, Jawa, scale 1:100:000. Geological Survey, Bandung.
Todd, D.K. and Mays, L.W., 2005. Groundwater Hydrology. 3rd edition. John Wiley and Sons Inc., 652pp.
Wang, J., Chen, Y., Shao, X., Zhang, Y., and Cao, Y., 2012. Land-use Change and Policy Dimension Driving Forces in China. Present, Trend, and Future, Land use Policy, 29, p.737-749.