Spatial Analysis and Geomorphic Characteristics of Coral Reefs on the Eastern Part of Lombok, Indonesia

Mutaqin, Bachtiar Wahyu

doi:10.21163/gt_2020.152.19

Cited by 7 publications

(10 citation statements)

References 36 publications

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“…Based on the last 14 years of data, normally, the study area's wave height ranges from 0.50 to 1.50 m but can exceed 2.00 m during the seasonal transition [45,46]. Currents in the study area are characterized by longshore currents with a dominant direction toward the south all year round, which its velocity can reach 1.7 m/s during the East Monsoon [34,45]. The tidal pattern in the study area is a diurnal tide, with the maximum high tide and the minimum low tide are 0.6 and −0.5 m, respectively [45].…”

Section: Study Areamentioning

confidence: 99%

“…The 1257 CE eruption of Samalas also produced pyroclastic density currents (PDCs) that entered the Bali Sea in the northern and the Alas Strait in the eastern part of Lombok [11,12,24,34] and might have caused a pyroclastic density current (PDC)-triggered tsunami [35][36][37][38][39][40]. The Alas Strait separates Lombok and Sumbawa Island with an average distance of about 14 km.…”

Section: Introductionmentioning

confidence: 99%

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Evidence of Unknown Paleo-Tsunami Events along the Alas Strait, West Sumbawa, Indonesia

et al. 2021

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Indonesia is exposed to earthquakes, volcanic activities, and associated tsunamis. This is particularly the case for Lombok and Sumbawa Islands in West Nusa Tenggara, where evidence of tsunamis is frequently observed in its coastal sedimentary record. If the 1815 CE Tambora eruption on Sumbawa Island generated a tsunami with well-identified traces on the surrounding islands, little is known about the consequences of the 1257 CE tremendous eruption of Samalas on the neighboring islands, and especially about the possible tsunamis generated in reason of a paucity of research on coastal sedimentary records in this area. However, on Lombok Island, the eruption of the Samalas volcano produced significant volumes of pyroclastic flows that entered the sea in the North and East of the island. These phenomena must have produced a tsunami that left their traces, especially on Sumbawa Island, whose western coastline is only 14 km away from Lombok’s eastern shore. Therefore, the main goal of this study is to investigate, find evidence, and determine the age of marine-origin sediments along the shore of the Alas Strait, Indonesia. We collected and analyzed samples of coral and seashells from marine deposits identified along the west coast of Sumbawa, i.e., in Belang Island and abandoned fishponds in Kiantar Village, in order to identify the sources and the occurrence period of these deposits events. Based on the radiocarbon dating of coral and seashell samples, we concluded that none of the identified marine deposits along the western coast of Sumbawa could be related chronologically to the 1257 CE eruption of Samalas. However, possible tsunami deposits located in Belang Island and abandoned fishponds in Kiantar Village yielded 4th century CE, 9th century CE, and 17th century CE. We also conclude that past large earthquakes triggered these tsunamis since no known volcanic eruption occurred near the Alas Strait at that time that may have triggered a tsunami.

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Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evidence of Unknown Paleo-Tsunami Events along the Alas Strait, West Sumbawa, Indonesia

et al. 2021

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“…Section A consists of Purworejo, Betahwalang, and Wedung Village; Section B consists of Berahan Kulon Village; Section C consists of Berahan Kulon and Berahan Wetan Village; and Section D consists of Kedungmalang, Kalianyar, Surodadi, Panggung, Bulakbaru, and Tanggultlare Village. This research divided the years 1995-2020 into four periods, namely 1995-2000, 2000-2011, 2011-2020. During 1995-2000, the shoreline in the study area shifted both seaward and landward (Fig.…”

Section: Shoreline Changementioning

confidence: 99%

“…The coastal area has high productivity of available resources and an essential role in supporting human lives (UNISDR/UNDP, 2012;Mutaqin, 2020;Marfai et al, 2020;Mutaqin et al, 2020). Hence, the coastal area is essential for human existence since almost all major cities are located in this area.…”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Analysis of Wulan Delta in Indonesia: Characteristics, Evolution, and Controlling Factors

Septiangga¹,

Mutaqin²

2021

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The evolution of the Wulan Delta began after the construction of the Wulan River Canal in 1892. It alters the shoreline erosion and accretion that affect the land dynamics of the coastal area. This study aims to analyze the spatio-temporal evolution of the Wulan Delta, including the shoreline and its dynamics, as well as the geomorphological processes that affect it. The shoreline change was extracted digitally from Landsat satellite images and divided into four periods, i.e.

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“…Coastal problems and management should factor in social aspects. Humans are an essential key in land use development and, thus, a driving factor in socio-ecological systems (Crossland 2005;Mutaqin 2020). Sediment in sample 3 was extremely poorly sorted because it was mixed with coral reefs on the seabed sediments.…”

Section: Sediment Cellsmentioning

confidence: 99%

Coastal Morphodynamic Analysis in Buleleng Regency, Bali - Indonesia

Marfai

Winastuti

Wicaksono

et al. 2021

Preprint

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Sediment as erosion products can affect shoreline, making sediment transport a key process to consider in coastal and shoreline management. Field surveys and secondary data can identify where suspended matters are distributed and deposited to analyze sediment uniformity factors: beach morphology and materials. This research set out to determine the Buleleng Regency's morphodynamic aspects based on the coastal landscape's physical characteristics and the processes acting upon each sediment cell. Field observations were conducted at five stations, from Tukad Gerokgak to Tukad Saba estuary. Jaelani's spectral transformation has been applied to analyze Total Suspended Solids using Sentinel 2A imagery. The laboratory test results of grain-size samples were processed on GRADISTAT, then the depositional environment and sediment transport direction were determined from average grain size, standard deviation, skewness, and kurtosis. Shoreline change, an indicator of coastal morphodynamics, was mapped from Landsat images in 2000, 2008, and 2019 using the Digital Shoreline Analysis System. Statistical analysis on GRADISTAT provided details on depositional environment and sediment transport and deposition based on grain-size distribution. Results indicate poorly sorted medium grain size: gravel (stone) to coarse sand, making up the sediment population from Tukad Gerokgak to Tukad Saba. Generally, sediment is deposited toward coarse, even very coarse, grain on a strongly sloping beach, and there is a high likeliness of sediment accretion. Identified morphodynamic characteristics suggest that the coastal landscape needs structural mitigation to overcome the accelerating impact of human activities and physical processes.

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Spatial Analysis and Geomorphic Characteristics of Coral Reefs on the Eastern Part of Lombok, Indonesia

Cited by 7 publications

References 36 publications

Evidence of Unknown Paleo-Tsunami Events along the Alas Strait, West Sumbawa, Indonesia

Evidence of Unknown Paleo-Tsunami Events along the Alas Strait, West Sumbawa, Indonesia

Spatio-Temporal Analysis of Wulan Delta in Indonesia: Characteristics, Evolution, and Controlling Factors

Coastal Morphodynamic Analysis in Buleleng Regency, Bali - Indonesia

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