Preliminary survey and performance of land subsidence in North Semarang Demak

Yuwono, Bambang Darmo; Abidin, Hasanuddin Z.; Gumilar, Irwan; Andreas, Heri; Awaluddin, Moehammad; Haqqi, K. F.; Khoirunisa, R.

doi:10.1063/1.4947410

Cited by 11 publications

(8 citation statements)

References 2 publications

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“…Figure 5. The gps data were processed using the GAMIT 10.6 [12]. GLRED / GLOBK processing can be done after the GAMIT process that produces h-files which is the main requirement in processing GLOBK.…”

Section: Methodsmentioning

confidence: 99%

Time Series of Land subsidence rate on Coastal Demak Using GNSS CORS UDIP and DINSAR

et al. 2019

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Most of the studies land subsidence and impact have been done on the north coastal area of Java, especially Semarang and Demak. This landsubsidence has a very serious impact both in the infra structure, the economy and the environment. Techniques of observing landsubsidence using geodetic methods have been widely practiced. Geodetic technology is undergoing rapid development, especially in GNSS navigation satellite technology as well as satellite radar interferometry. Both have advantages and disadvantages of each. In this study will examine the application of DinSAR interferometric techniques and GNSS technology to predict the rate of land subsidence coastal of Demak regency. This paper also emphasize the role of GNSS and DinSAR application in deformation especially for landsubsidence monitoring.

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Section: Methodsmentioning

confidence: 99%

Time Series of Land subsidence rate on Coastal Demak Using GNSS CORS UDIP and DINSAR

et al. 2019

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“…In this study, a land subsidence of 1.3 meters (Fig. 18) was assumed based on a land subsidence rate of 13 cm/year or 0.13 m/year around the port for the past 10 years, as reported in previous studies [5]. The seawall crest elevation needs to take the land subsidence into account.…”

Section: 𝐷𝑊𝐿 = 𝐻𝐴𝑇 + 𝑆𝑆 𝑜𝑟 𝑊𝑆 + 𝑆𝐿𝑅mentioning

confidence: 99%

“…The soil around Semarang coast experiences natural compaction leads to land subsidence [4]. Based on previous research, the rate of land subsidence around Semarang is 9 to 13 cm/year [5]. In addition to that, sea level rise was predicted to be about 0.6 -0.9 m from 1990 to 2100 due to global warming [6].…”

Section: Introductionmentioning

confidence: 99%

Wave distribution and proposed seawall design around Tanjung Emas Port, Semarang

Wijayanti,

Nurfaida,

Sulaiman

et al. 2023

E3S Web Conf.

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On May 23rd, 2022, an extreme coastal event occurred around the northern coast of Java. This event had caused the collapsed of several seawall segments around Tanjung Emas Port, Semarang. Combined with wave overtopping, it led to severe flooding and economic damages to the port operation. Responding to the event, this research aimed to characterize the hydrodynamic condition around the port and proposed a seawall design. The research was done through field observation, wave climate characterization, and numerical simulation. The field observation confirmed the extent of the damage and wave condition around the harbour. The wave climate study, based on a global wave reanalysis data, confirmed that the offshore wave height could reach 3 m during high wave season, with wave period of 4 – 6 seconds coming from the northwest. The tidal range is up to 1 m with highest astronomical tide (HAT) is at +0.65 MSL. The extreme value analysis gave a 3.7 meter of offshore design wave height for 100-year return period or up to 1.7 meters wave height nearshore. The proposed seawall crest elevation is at least at +3.40 meters above the mean sea level to avoid overtopping, which is 1.1 m higher than the existing seawall.

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“…In Semarang, the largest GPS surveys were conducted by the ITB from 2008 to 2011 and by the Geological Agency since 2006. Other ITB campaigns happened between 2011 and 2015 and in 2017-2020 (results published by Abidin et al, 2015;Andreas et al, 2019b;Gumilar et al, 2013;Yuwono et al, 2016). Like levelling, GPS is considered very precise (accurate to the mm level) (Lubis et al, 2011), while less costly, GPS is still timeand human labour intensive (Chaussard et al, 2013;Yastika et al, 2019).…”

Section: Early Stage Of Land Subsidence Science and Main Measuring Me...mentioning

confidence: 99%

Destabilizing the science of soils: Geoscientists as spokespersons for land subsidence in Semarang, Indonesia

Belland,

Kooy,

Zwarteveen

2023

Environment and Planning E: Nature and Space

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In this article, we explore how land subsidence is scientifically known in the coastal city of Semarang, Indonesia. We do so to ask questions about how the authority of this scientific knowledge is or not effective to help slow down land subsidence? We examine the scientific methods used to measure where, and at what rate, subsidence occurs, and we inventory the theories mobilized to interpret and explain them. Our analysis shows how land subsidence resists being fully or unambiguously known; its science remains somewhat speculative. We explore how, in Semarang, but also more broadly, this makes it difficult for subsidence scientists to act as effective ‘spokespersons’ for subsidence; their predictions lack certainty and confidence. As we follow the subsidence debates in Semarang we document how subsidence scientists need the authority of science to speak convincingly to powerful elite coalitions of government agencies and private companies, who have vested interests in ignoring or denying their role in causing or accelerating subsidence. We identify this as one reason why subsidence scientists deploy great efforts to present themselves, and their science, as separate from politics and society, as detached and therefore objective. Beyond contributing to emergent discussions in science and technology studies about how science shapes underground politics, our analysis opens up and sheds new light on the question of how scientific facts become entangled with politics in societal controversies.

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Preliminary survey and performance of land subsidence in North Semarang Demak

Cited by 11 publications

References 2 publications

Time Series of Land subsidence rate on Coastal Demak Using GNSS CORS UDIP and DINSAR

Time Series of Land subsidence rate on Coastal Demak Using GNSS CORS UDIP and DINSAR

Wave distribution and proposed seawall design around Tanjung Emas Port, Semarang

Destabilizing the science of soils: Geoscientists as spokespersons for land subsidence in Semarang, Indonesia

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