Salinity Pattern in Semarang Coastal City: An Overview
<p>DOI: <span><a href="http://dx.doi.org/10.17014/ijog.v8i2.160" target="_blank">10.17014/ijog.v8i2.160</a></span></p><p>Semarang Coastal City is one of cities in Indonesia which has experienced a long-term salt intrusion. Land subsidence...
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| Format: | Article |
| Language: | English |
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Geological Agency
2014-07-01
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| Series: | Indonesian Journal on Geoscience |
| Subjects: | |
| Online Access: | https://ijog.geologi.esdm.go.id/index.php/IJOG/article/view/160 |
| _version_ | 1819230074349551616 |
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| author | Novi Rahmawati M. A. Marfai |
| author_facet | Novi Rahmawati M. A. Marfai |
| author_sort | Novi Rahmawati |
| collection | DOAJ |
| description | <p>DOI: <span><a href="http://dx.doi.org/10.17014/ijog.v8i2.160" target="_blank">10.17014/ijog.v8i2.160</a></span></p><p>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.<br /><br /></p> |
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| issn | 2355-9314 2355-9306 |
| language | English |
| last_indexed | 2024-12-23T11:23:17Z |
| publishDate | 2014-07-01 |
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| spelling | doaj.art-ff23bc4104b6423b8a3cd26ba33bb71e2022-12-21T17:49:01ZengGeological AgencyIndonesian Journal on Geoscience2355-93142355-93062014-07-018210711810.17014/ijog.8.2.107-118160Salinity Pattern in Semarang Coastal City: An OverviewNovi Rahmawati0M. A. Marfai1Master in Planning and Management of Coastal Area and Watershed, Faculty of Geography, Gadjah Mada University, Bulaksumur, YogyakartaDepartment of Environmental Geography, Faculty of Geography, Gadjah Mada University, Bulaksumur, Yogyakarta<p>DOI: <span><a href="http://dx.doi.org/10.17014/ijog.v8i2.160" target="_blank">10.17014/ijog.v8i2.160</a></span></p><p>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.<br /><br /></p>https://ijog.geologi.esdm.go.id/index.php/IJOG/article/view/160electrical conductanceland usesalinity patternSemarang Coastal City |
| spellingShingle | Novi Rahmawati M. A. Marfai Salinity Pattern in Semarang Coastal City: An Overview Indonesian Journal on Geoscience electrical conductance land use salinity pattern Semarang Coastal City |
| title | Salinity Pattern in Semarang Coastal City: An Overview |
| title_full | Salinity Pattern in Semarang Coastal City: An Overview |
| title_fullStr | Salinity Pattern in Semarang Coastal City: An Overview |
| title_full_unstemmed | Salinity Pattern in Semarang Coastal City: An Overview |
| title_short | Salinity Pattern in Semarang Coastal City: An Overview |
| title_sort | salinity pattern in semarang coastal city an overview |
| topic | electrical conductance land use salinity pattern Semarang Coastal City |
| url | https://ijog.geologi.esdm.go.id/index.php/IJOG/article/view/160 |
| work_keys_str_mv | AT novirahmawati salinitypatterninsemarangcoastalcityanoverview AT mamarfai salinitypatterninsemarangcoastalcityanoverview |