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Dwi Sarah
Research Center for Geotechnology, Indonesian Institute of Sciences (LIPI), Jl. Cisitu, Sangkuriang Bandung 40135, Indonesia

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Journal article
Published: 17 May 2021 in Water
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Since 1900, Semarang City has been meeting its industrial water needs by pumping groundwater through its underlying aquifers. The trend toward exploiting groundwater resources has driven the number of deep wells and their production capacity to increase, and therefore leads to the water table to drop from time to time, which has been marked as one of the primary causes of land subsidence there. The main aim of the current study was to numerically model the temporal and spatial evolution of groundwater table under excess abstraction so that a groundwater management strategy can be accordingly drawn up for ensuing the sustainability of groundwater resources in the future. A series of numerical simulations were carried out to take into account hydrogeological data, artificial and natural discharges of deep wells, and boundary effects in Semarang City. The groundwater modeling is calibrated under two flow conditions of the steady state from 1970 to 1990 and the transient state from 1990 to 2005 for six observation wells distributed in Semarang City. Four scenarios that reflect potential management strategies were developed, and then their effectiveness was systematically investigated. The results of our study indicate that the implementation of proper groundwater control management and measure is able to restore the groundwater level to rise back in Semarang City, and in turn achieve the sustainability of groundwater resources.

ACS Style

Weicheng Lo; Sanidhya Purnomo; Dwi Sarah; Sokhwatul Aghnia; Probo Hardini. Groundwater Modelling in Urban Development to Achieve Sustainability of Groundwater Resources: A Case Study of Semarang City, Indonesia. Water 2021, 13, 1395 .

AMA Style

Weicheng Lo, Sanidhya Purnomo, Dwi Sarah, Sokhwatul Aghnia, Probo Hardini. Groundwater Modelling in Urban Development to Achieve Sustainability of Groundwater Resources: A Case Study of Semarang City, Indonesia. Water. 2021; 13 (10):1395.

Chicago/Turabian Style

Weicheng Lo; Sanidhya Purnomo; Dwi Sarah; Sokhwatul Aghnia; Probo Hardini. 2021. "Groundwater Modelling in Urban Development to Achieve Sustainability of Groundwater Resources: A Case Study of Semarang City, Indonesia." Water 13, no. 10: 1395.

Journal article
Published: 08 April 2018 in Geosciences
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Semarang-Demak and other cities along the coast of North Java are vulnerable to land subsidence. The presence of saline groundwater in the coastal region is thought to affect the high subsidence rate, in this case the compressibility of the aquitard layer. We aimed to analyze the effects of groundwater salinity on the compression characteristics of the Semarang-Demak clay using physical analysis. Methods included the determination of groundwater salinity, clay mineralogy and fabrics, and consolidation tests under various salinity conditions. The Semarang-Demak clay is dominated by smectite of high activity, and saline clay exists at the depth of 10 to 35 m. Consolidation tests revealed that the increase insalinity increases the average consolidation rate and hydraulic conductivity up to 42% and 37.5%, respectively. Clay fabric analysis showed that the groundwater salinity modified the interconnectivity of pores by changing the fabric into parallel alignments, facilitating faster porewater dissipation, hence the clay is more readily compressed. These findings are useful for explaining the mechanism of the fast-subsiding coastal plains of North Java.

ACS Style

Dwi Sarah; Lambok M. Hutasoit; Robert M. Delinom; Imam A. Sadisun; Taufiq Wirabuana. A Physical Study of the Effect of Groundwater Salinity on the Compressibility of the Semarang-DemakAquitard, Java Island. Geosciences 2018, 8, 130 .

AMA Style

Dwi Sarah, Lambok M. Hutasoit, Robert M. Delinom, Imam A. Sadisun, Taufiq Wirabuana. A Physical Study of the Effect of Groundwater Salinity on the Compressibility of the Semarang-DemakAquitard, Java Island. Geosciences. 2018; 8 (4):130.

Chicago/Turabian Style

Dwi Sarah; Lambok M. Hutasoit; Robert M. Delinom; Imam A. Sadisun; Taufiq Wirabuana. 2018. "A Physical Study of the Effect of Groundwater Salinity on the Compressibility of the Semarang-DemakAquitard, Java Island." Geosciences 8, no. 4: 130.

Conference paper
Published: 22 February 2018 in IOP Conference Series: Earth and Environmental Science
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Cities on the north coast of Java such as Jakarta, Semarang, Pekalongan, and Surabaya are vulnerable to environmental pressures such as sea level change and land subsidence. Land subsidence can be caused by natural and anthropogenic processes. Geologically, the north coastal plain of Java consists of unconsolidated Holocene alluvial deposit. The recent alluvial deposit is prone to compaction, and further aggravated by anthropogenic forces such as groundwater extraction and land development. Understanding the complex interaction of natural and manmade factors is essential to establish mitigation strategy. Although the impacts of land subsidence are widely felt, many do not realize that land subsidence is taking place. This paper presents a brief review of the land subsidence threats in the North coast of Java and proposes a recommendation for suitable management response.

ACS Style

D Sarah; E Soebowo. Land subsidence threats and its management in the North Coast of Java. IOP Conference Series: Earth and Environmental Science 2018, 118, 012042 .

AMA Style

D Sarah, E Soebowo. Land subsidence threats and its management in the North Coast of Java. IOP Conference Series: Earth and Environmental Science. 2018; 118 (1):012042.

Chicago/Turabian Style

D Sarah; E Soebowo. 2018. "Land subsidence threats and its management in the North Coast of Java." IOP Conference Series: Earth and Environmental Science 118, no. 1: 012042.