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Journal : Forum Geografi

Land Subsidence Analysis of Reclaimed Land using Time-Lapse Microgravity Anomaly in Manado, Indonesia Wibowo, Sandy Nur Eko; Mamuaya, Gybert E.; Djamaluddin, Rignolda
Forum Geografi Vol 32, No 1 (2018): July 2018
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v32i1.5882

Abstract

Coastal area land reclamation is a policy with various benefits, including its potential to increase economic growth. However, reclamation also potentially has adverse impacts on the environment, including increasing pressure on biodiversity, natural resources and natural ecosystems, and the most common problem is land subsidence. This study uses time-lapse microgravity anomaly to ascertain the distribution of gravity and vertical gradient anomaly in order to map the subsidence characteristics occurring in the Manado reclamation area. From the research that has been previously conducted, the positive gravity anomaly is spread around Megamall-Multimart to the north of Monaco Bay and on the southern side of Manado Town Square (Mantos). Positive anomaly values range from 3 to 29.7 μGal. The negative anomaly values are scattered around the Mantos and Megamas separating bridge and at some points around the Whiz Prime Hotel, Menora Church and towards the Pohon Kasih Megamas area. The reclaimed areas generally experience subsidence accompanied by a reduction in groundwater mass (Megamall and Mantos) due to the use of the groundwater by the community in these areas. Uplifts also occur at some points in the reclamation area of Megamas as a result of the occurrence of land subsidence. Longer-term research is needed to determine whether there is an increase in the rate of land subsidence in the Manado reclamation area. Over a longer period of time it can also be established whether there are other factors which affect land subsidence. Other geodetic methods to monitor subsidence, such as levelling, InSAR and GPS survey, which have been conducted in other locations, are also needed to obtain more detailed information about the land subsidence in this area.
Land Subsidence Analysis of Reclaimed Land using Time-Lapse Microgravity Anomaly in Manado, Indonesia Sandy Nur Eko Wibowo; Gybert E. Mamuaya; Rignolda Djamaluddin
Forum Geografi Vol 32, No 1 (2018): July 2018
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v32i1.5882

Abstract

Coastal area land reclamation is a policy with various benefits, including its potential to increase economic growth. However, reclamation also potentially has adverse impacts on the environment, including increasing pressure on biodiversity, natural resources and natural ecosystems, and the most common problem is land subsidence. This study uses time-lapse microgravity anomaly to ascertain the distribution of gravity and vertical gradient anomaly in order to map the subsidence characteristics occurring in the Manado reclamation area. From the research that has been previously conducted, the positive gravity anomaly is spread around Megamall-Multimart to the north of Monaco Bay and on the southern side of Manado Town Square (Mantos). Positive anomaly values range from 3 to 29.7 μGal. The negative anomaly values are scattered around the Mantos and Megamas separating bridge and at some points around the Whiz Prime Hotel, Menora Church and towards the Pohon Kasih Megamas area. The reclaimed areas generally experience subsidence accompanied by a reduction in groundwater mass (Megamall and Mantos) due to the use of the groundwater by the community in these areas. Uplifts also occur at some points in the reclamation area of Megamas as a result of the occurrence of land subsidence. Longer-term research is needed to determine whether there is an increase in the rate of land subsidence in the Manado reclamation area. Over a longer period of time it can also be established whether there are other factors which affect land subsidence. Other geodetic methods to monitor subsidence, such as levelling, InSAR and GPS survey, which have been conducted in other locations, are also needed to obtain more detailed information about the land subsidence in this area.
Co-Authors Adnan Wantasen Adri A Tarumingkeng Adrie A. Tarumingkeng Agung B. Windarto, Agung B. Agung Windarto Alex D. Kambey Angmalisang, Ping Astony Antonius P. Rumengan Antonius P. Rumengan Ari Berty Rondonuwu Azani, Audia Azizah Bataragoa, Nego Buamona, Dedi Calvyn F. A. Sondak, Calvyn F. A. Carolus P. Paruntu Darus S. Paransa Dien, Heffry Veibert Edwin L.A. Ngangi Esry T Opa Esther D. Angkouw Gabriel F. Tulung Gaspar D. Manu, Gaspar D. Glorima J. A. Tijow Godwin Parulian Tindaon Gybert E Mamuaya Gybert E. Mamuaya Gybert E. Mamuaya Hermanto W. K. Manengkey Hermanto W. K. Manengkey Hermanto W.K. Manengkey Indri Manembu Inneke F. M Rumengan Irfan Sirajudin Jane M. Mamuaja Joice R.T.S.L Rimper Joshian N. W. Schaduw Joudy R. R. Sangari Kumampung, Deislie R. H. Kusumawardani, Niken Lahimade, Melisa Mamuaya, Gybert E. Manengkey, Hermanto Manengkey, Hermanto W.K. Mantiri, Desy M. H Manu, Lusia Marpaung, Renaldy Alexander Modalo, Robert Natalie D. C. Rumampuk Nurfitriani Nurfitriani, Nurfitriani Opa, Esri T. Opa, Esry P. Astony Angmalisang Pelle, Wilmy Etwil Ping A. Angmalisang Priyobudi Priyobudi Rampengan, Royke Rauf, Aprianto Rene C. Kepel Reynaldo Mangore Richard R. Mumu Ridwan Lasabuda Riyadi . Robert A. Bara Robert A. Bara Robert Owen Wahyu Royke M Rampengan Royke M. Rampengan Royke M. Rampengan Salaki, Meiske Sofie Salvatore a’Paulo Narahawarin Sandy Nur Eko Wibowo Sandy Nur Eko Wibowo Sangari, Joudy R. R. Sapsuha, Jufran Simboh, Reyvalentin Sinyal, Hengky J Situmorang, Ezra Monika Suria Darwisito, Suria Tatok Yatimantoro Wilmy E. Pelle Windarto, Firmansyah Candra Yatimantoro, Tatok Yongky W. Bawangun