scholarly journals Effect of seawater intrusion on groundwater in the Demak coastal area Indonesia: a review

2021 ◽  
Vol 896 (1) ◽  
pp. 012070
Author(s):  
A W Pramita ◽  
S Syafrudin ◽  
D N Sugianto
Keyword(s):  
Seawater Intrusion ◽  
Coastal Area ◽  
Groundwater Resources ◽  
Coastal Region ◽  
Source Area ◽  
The North ◽  
Central Java ◽  
Safety And Health ◽  
Management Plans ◽  
Erosion Area

Abstract One of the most complicated areas to repair on the North Shore of Central Java is the beach in the Sayung Demak. More than 300 hectares of land have been flooding in the last five years due to high tides. The erosion area in Sayung area has also been affected by port development activities in the Semarang area, thus changing the hydrodynamic nature of Sayung Demak Waters. Overuse of groundwater has been showing to lead to brine ingress in the coastal region. And long-term groundwater withdrawal forces land subsidence formation. A few waterfront structures in Sayung waters were built as breakwaters to decrease incoming waves. The solution presently used to minimize erosion while catching sediment in the Sayung area is hybrid engineering. The purpose of this study is to review the effectiveness of hybrid engineering in the coastal area of Demak and its relation to seawater intrusion and groundwater based on previous research. Understanding the factors that influence water quality in the source area over time is needed to establish appropriate management plans for the protection of groundwater resources and to ensure the safety and health of the beverage.

scholarly journals MONITORING OF MANGROVE GROWTH AND COASTAL CHANGES ON THE NORTH COAST OF BREBES, CENTRAL JAVA, USING LANDSAT DATA

2020 ◽  
Vol 16 (2) ◽  
pp. 197
Author(s):  
Tri Muji Susantoro ◽  
Ketut Wikantika ◽  
Lissa Fajri Yayusman ◽  
Alex Tan ◽  
M. Firman Ghozali
Keyword(s):  
Coastal Area ◽  
Vegetation Index ◽  
Series Data ◽  
North Coast ◽  
Landsat Data ◽  
Coastal Change ◽  
The North ◽  
Central Java ◽  
Normalised Difference Vegetation Index ◽  
Coastal Changes

Severe abrasion occurred in the coastal area of Brebes Regency, Central Java between 1985 and 1995. Since 1997, mangroves have been planted around the location as a measure intended to prevent further abrasion. Between 1996 and 2018, monitoring has been carried out to assess coastal change in the area and the growth and development of the mangroves. This study aims to monitor mangrove growth and its impact on coastal area changes on the north coast of Brebes, Central Java Province using Landsat series data, which has previously proven suitable for wetland studies including mangrove growth and change. Monitoring of mangrove growth was analysed using the normalised difference vegetation index (NDVI) and the green normalised difference vegetation index (GNDVI) of the Landsat data, while the coastal change was analysed based on the overlaying of shoreline maps. Visual field observations of WorldView 2 images were conducted to validate the NDVI and GNDVI results. It was identified from these data that the mangroves had developed well during the monitoring period. The NDVI results showed that the total mangrove area increased between 1996 and 2018 about 9.82 km2, while the GNDVI showed an increase of 3.20 km2. Analysis of coastal changes showed that the accretion area about 9.17 km2 from 1996 to 2018, while the abrasion being dominant to the west of the Pemali River delta about 4.81 km2. It is expected that the results of this study could be used by government and local communities in taking further preventative actions and for sustainable development planning for coastal areas.

scholarly journals REVIEW OF THE LAND SUBSIDENCE HAZARD IN PEKALONGAN DELTA, CENTRAL JAVA: INSIGHTS FROM THE SUBSURFACE

2021 ◽  
Vol 36 (4) ◽  
pp. 163-176
Author(s):  
Dwi Sarah ◽  
Eko Soebowo ◽  
Nugroho Aji Satriyo
Keyword(s):  
Land Subsidence ◽  
Groundwater Resources ◽  
Research Direction ◽  
Future Research ◽  
Land Loss ◽  
Subsurface Geology ◽  
The North ◽  
Central Java ◽  
Over Exploitation ◽  
Global Threat

Land subsidence is a global threat to coastal areas worldwide, including the North Java coastal area. Of many areas experiencing land subsidence in North Java, the rate of land subsidence in Pekalongan has matched the high subsidence rates usually found in big cities. The rate of land subsidence in Pekalongan far exceeds the sea-level rise, resulting in a looming threat of land loss. The devastating impacts of land subsidence are the manifestation of its subsurface movement. Therefore, it is essential to understand the subsurface to elucidate the mechanism of land subsidence. Previous studies on land subsidence in Pekalongan are mainly related to subsidence rate monitoring and have not elaborated on the subsurface condition. This paper reviews the Pekalongan subsurface geology based on available literature to provide insight into the land subsidence problem. The results revealed that the land subsidence occurs in the recent alluvial plain of Pekalongan, consisting of a 30-70 m thick compressible deposit. Possible mechanisms of land subsidence arise from natural compaction, over-exploitation of confined groundwater, and increased built areas. As the seismicity of the study area is low, tectonic influence on land subsidence is considered negligible. It is expected that the offshore, nearshore, and swamp deposits are still naturally compacting. As the surface water supply is minimal, over-exploitation of groundwater resources from the deltaic and Damar Formation aquifers occurs. In the end, future research direction is proposed to reduce the impacts of the subsidence hazard.

scholarly journals AN ANALYSIS OF RE GIONAL IMBALANCES IN IRAN: A CASE STUDY OF NORTH COASTAL AREAS

2017 ◽  
Vol 15 (3) ◽  
Author(s):  
Masoud Taghvaei ◽  
Sirous Shafaghi ◽  
Mohammadreza Ghaderi
Keyword(s):  
Coastal Area ◽  
Survey Methods ◽  
Geographical Area ◽  
Coastal Region ◽  
Analytical Techniques ◽  
Study Data ◽  
Effective Factors ◽  
Balanced Development ◽  
The North ◽  
The Impact

In countries such as Iran, which cover a large geographical area, the issue of inequality and regional differences provide a substantial challenge in the effort to achieve balanced development. In this study, data were collected using documentary and survey methods as well as Delphi techniques, and analysis was carried out by combining qualitative and quantitative models. In the second step of the Delphi technique, a study of the impact of the factors on each other, and on the regional inequalities of the North coastal area, was made using the crossimpact method. In the final step, the effective factors contributing to the inequalities of the North coastal region were studied using analytical techniques and MicMac software. After analyzing the impact rate of the effective factors on regional imbalances, the key factors were identified and, finally, solutions to reduce the regional imbalances of the North coastal area were proposed.

scholarly journals Vegetation Stratification in Semarang Coastal Area

2019 ◽  
Vol 11 (1) ◽  
pp. 139-147
Author(s):  
Nana Kariada Tri Martuti ◽  
Yustinus Ulung Anggraito ◽  
Septiana Anggraini
Keyword(s):  
Coastal Area ◽  
Qualitative Data ◽  
Positive Impact ◽  
Coastal Region ◽  
Morphological Characteristics ◽  
Conservation Strategy ◽  
Plant Identification ◽  
Central Java ◽  
Different Types ◽  
Index Of Diversity

The coastal region is a dynamic area as a transition between the land and the sea. The ecological function of the coastal area is affected mainly by the structure and composition of vegetation factors. This study aims to analyze the vegetation stratification of terrestrial to marine ecosystems in the coastal area of Semarang City, Central Java Indonesia as an effort to manage a sustainable ecosystem. A striped path combined with nested plots were applied in this research. The plots were placed by systematic purposive sampling based on the homogeneity of vegetation found along with the topographic conditions of the research location. Analysis of qualitative data used by way of inventorying plants and identifying plants based on morphological characteristics that can be observed. Data analysis was performed based on the results of an inventory of the structure and composition of vegetation obtained including the index of diversity, evenness, and species richness. The results of plant identification found in the three locations recorded 51 plant species consisting of 29 families. The different types of vegetation in Taman Lele, Tapak, and Tirang Beach affect the diversity, richness, and evenness index of vegetation in all three locations. Therefore, it can be concluded that different environmental factors contribute to the vegetation stratification from the land to the sea. This is the first report on the Semarang coastal area vegetation stratification. The results can have a positive impact on the coastal area conservation strategy for sustainable management, as well as to be a media for environmental education purpose.

scholarly journals Modeling and Mapping of coastal aquifer vulnerability to seawater intrusion using SEAWAT code and GALDIT index technique: the case of the Rmel aquifer – Larache, Morocco

2021 ◽  
Vol 298 ◽  
pp. 05002
Author(s):  
Mohamed Jalal El Hamidi ◽  
Abdelkader Larabi ◽  
Mohamed Faouzi
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
Sea Level Rise ◽  
Sea Level ◽  
Seawater Intrusion ◽  
Climate Models ◽  
Groundwater Resources ◽  
Climate Projections ◽  
The North ◽  
And Sea Level

The study area of Rmel-O. Ogbane aquifer, located in the north of Morocco, currently faces major water challenges related to the sustainable management of water resources. Climate change and Sea-Level-Rise can increase the risks and costs of water resources management and impact water resources' quantity and quality. Hence, for planning and management, an integrated approach is developed for linking climate models and groundwater models to investigate future impacts of climate change on groundwater resources. Climate projections show an increase in temperature of about 0.45 °C and a reduction in precipitation of 16.7% for 2016-2050. Simulations of seawater intrusion corresponding to various combinations of groundwater extraction predicted climate change and sea-level-rise show that the area will be contaminated on the NW sector of the coastal part. The toe would reach about 5.2 km inland and intrude on high salinity (15–25g/l). Beyond these zones, the contamination of the aquifer will be limited. Moreover, these results were confirmed by the application of the GALDIT method. They reveal that the fringe littoral areas of the aquifer are the most affected by seawater intrusion, with a high risk in the north-western part of the study area.

scholarly journals Kondisi Geologi Lingkungan di Wilayah Pesisir Sluke Kabupaten Rembang Provinsi Jawa Tengah

2016 ◽  
Vol 19 (1) ◽  
pp. 67 ◽  
Author(s):  
Sugeng Widada
Keyword(s):  
Coastal Area ◽  
Secondary Data ◽  
Primary Data ◽  
Water Current ◽  
Geological Condition ◽  
The North ◽  
Central Java ◽  
Tidal Data ◽  
Sediment Data ◽  
Cement Factories

Kabupaten Rembang merupakan  salah satu Kabupaten di Provinsi Jawa Tengah yang sangat strategis, karena terletak pada lintasan jalur pantai utara Jawa yang menghubungkan antara propinsi Jawa Barat dan Jawa Timur. Potensi strategis Kabupaten Rembang adalah bidang industri, pertambangan, jasa dan perdagangan. Pada saat ini telah berdiri PLTU Rembang dan tahap awal pembangunan beberapa  pabrik semen diantaranya adalah  PT. Indonesia Rembang di Kecamatan Sluke. Keberadaan PLTU Rembang dan Pabrik Semen Indonesia Rembang di Kecamatan Sluke bepengaruh terhadap kondisi geologi lingkungan wilayah tersebut Penelitian ini bertujuan untuk mengetahui tatanan litologi dan proses hidrooseanografi yang terjadi di daerah kajian dan dampaknya terhadap lingkungan fisik daerah yang bersangkutan. Penelitian ini menggunakan metode diskripstif - eksploratif dari daerah studi dengan cara mengungkapkan kondisi daerah penelitian dengan aktual, akurat sesuai dengan fakta yang terdapat di lapangan serta pendekatan pemodelan matematis untuk menggambarkan perubahan garis pantai pantai. Data primer yang digunakan dalam penelitian ini adalah meliputi data arus, data gelombang, dan data sedimen dasar. Sedangkan data sekunder berupa batimetri, topografi, angin dan pasut diperoleh dari Bakosortanal dan Dishidros. Hasil penelitian menunjukan Pesisir Sluke mempunyai morfologi dataran pantai dengan kelerengan < 2 % dengan elevasi 2 – 6 m dpl yang bebatasan langsung dengan perbukitan di belakangnya yang berlereng > 15 %. Litologi penyusun dataran tersebut adalah pasir lanau dengan batuan dasar berupa batupasir dan batugamping. Sedimen dasar pada tepi pantai didominansi oleh pasir dengan kandungan cangkang, sedangkan sedimen dasar di perairan yang lebih dalam berupa lempung dan lanau. Abrasi yang terjadi di daerah penelitian berdampak pada hilangnya jalan di sawah penduduk sebelah barat PLTU Rembang, robohnya pohon kelapa karena tanah tempat perakarannya terabrasi dan rusaknya dinding pelindung pantai pada lahan milik Pemda di sebelah barat PLTU Rembang. Kata Kunci: geologi lingkungan, abrasi, Sluke  Rembang is one of the most strategic residence in Central Java Province. It is located in the Northern main road that is connecting West Java and East Java. The strategic potentials in Rembang residence are industries, mines, services and trading. Recently a PLTU plant and an early construction of some cement factories, such as PT. Indonesia Rembang in Sluke subdistrict. PLTU Rembang and Pabrik Semen Indonesia Rembang in Sluke subdistrict affected the geological condition in the area. This research aimed to know the lithological structure and the hydrooceanography process occured in the study area and their effect to the pysical condition the regarded area. A descrriptive-explorative method was used in this research.  Primary data used in this research including water current, wave and basic sediment data. While the secondary data including bathimetry, topography, wind speed and direction,  and tidal data obtained from Bakosurtanal and Dishidros. Base on those data and the mathematical modelling, the coast line dynamic was described. The result of the research showed that Sluke coastal area had  land slope < 2% and 2-6 m dpl elevasion close to border on the hills in the back with a slope > 15%. The lithology composed the land was silt with natural rocks composed of sand and limestone. The sediment in the surface coastal area was dominated by sand that contains shell.  While the sediment in the deeper waters bottom composed of clay and silt. Abrassion occured in the study area affected in the vanishing of  the path in the ricefields in the northern of PLTU Rembang, the collapse of the coconut trees  and the damage of the wall in the government’s land in the north of PLTU Rembang. Keywords: geological environment, abrasion, Sluke

scholarly journals Community Group Networking on the Community-based Adaptation Measure in Tapak Village, Semarang Coastal Area

2020 ◽  
Vol 52 (2) ◽  
pp. 181
Author(s):  
Bintang Septiarani ◽  
Wiwandari Handayani
Keyword(s):  
Coastal Area ◽  
Stakeholder Analysis ◽  
North Coast ◽  
Poor People ◽  
Community Group ◽  
Community Based ◽  
Adaptation Measures ◽  
The North ◽  
Central Java ◽  
Community Based Adaptation

The north coast of Central Java is one of the most vulnerable regions to climate change in Indonesia. Various activity in coastal area also leads to the growing of informal sector that closely related to the growing number of poor people in coastal area. Therefore, the loss of livelihood triggers the awareness of stakeholder to help people through Community-based Adaptation (CBA) in Semarang coastal area. This paper aims to elaborate on the importance of networking aspect in CBA that works in Semarang Coastal Area. Scope area of this research is Tapak Village which regarded as a pilot area of CBA implementation in Semarang. Stakeholders mapping and social network analysis was used to visualizing the community interaction in their adaptation measures. The purposive sample in interviewing CBA stakeholders is used to support the stakeholder analysis using Gephi 0.9 software. The finding shows that the existence of networks between the community and the relevant stakeholders such as NGO and local government also became one of the supporting factors for the sustainability of community-based adaptation approach in coastal areas of Semarang City. 

scholarly journals Mapping of Seawater Intrusion into Coastal Aquifer: A Case Study of Pekalongan Coastal Area in Central Java

2020 ◽  
Vol 6 (1) ◽  
pp. 183
Author(s):  
Muhammad Irham Sahana ◽  
Roh Santoso Budi Waspodo
Keyword(s):  
Groundwater Quality ◽  
Seawater Intrusion ◽  
Ad Hoc ◽  
Sea Water ◽  
Chloride Ion ◽  
Distance Method ◽  
The North ◽  
Central Java ◽  
Freshwater Zone ◽  
Logarithmic Equation

Seawater intrusion promotes the degradation of groundwater quality through excessive pumping activities or natural phenomena such as tidal floods which are popular with coastal areas. Pekalongan city is one of the areas affected by this phenomenon and was analyzed in this study with reference to the 1986 Ad Hoc Sea Water Intrusion (PAHIAA) Decree which classifies water into five based on salinity. This involved using the Integrated Distance Method (IDW) to map and applying the logarithmic equation to determine the dispersion relationship. The results showed seawater intrusion has already affected groundwater quality up to 6.52 km from the coastline for total dissolved solids and electrical conductivity and 7.22 km for chloride ion.  The distribution of TDS, EC, and Cl- in the freshwater zone was also recorded to have reached 28.59 km2, 28.36 km2, and 23.95 km2 respectively. It is predicted that in 4 years, there would no longer be freshwater in Padukuhan Kraton Village due to decreasing groundwater quality caused by seawater intrusion. Furthermore, 23.03 km2 Pekalongan area which spread into 4.34 km2 to the West, 0 km2 to the South, 14.39 km2 to the North, and 1.28 km2 to the East of the district has also been affected and was discovered to be caused mainly by tidal flood from Bremi and Tirto rivers. 

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