Northern Coast Of Java Research Articles

KETUPAT EID TRADITION OF THE NORTH COAST OF JAVA AS AN ALTERNATIVE MATHEMATICS LEARNING MEDIA

Learning mathematics requires real situations that students often face. Tradition as local wisdom from the surrounding community can be used for learning mathematics so that students can reach the context of abstract mathematics. In this article, the researcher explains how teachers can take advantage of local culture and traditions in the form of Ketupat Eid on the north coast of Java to be used in learning mathematics. This research was conducted on the northern coast of Java, where every seventh day after Eid Mubarak, the area performs the Ketupat Eid tradition. Researchers tried to connect some foods that only exist in the Ketupat Eid tradition in the form of Ketupat and Lepet with mathematics in school. The results showed that diamonds could be used for rhombuses, prisms, and beams, and Lepet can be used as a tube context in geometry learning.

MYSTICAL DISCOURSE IN JAVA IN THE 18TH CENTURY NARRATED BY THE BOOK OF CABOLEK

This article discusses the discourse of Sufism in the 18th century in Java as narrated by Serat Cabolek by Kiai Yasadipura I (1729-1803). This manuscript tells about the trial of Kiai Ahmad Mutamakin in front of the authorities of the Mataram Kingdom in Kartasura. This cleric from the village of Cabolek, Tuban, in the northern coast of Java was controversial and accused of spreading Ilmu Hak, namely wujudiyah Sufism, to commoners, even though his knowledge capacity was considered inadequate by the religious scholars (ulama) who opposed him. In that trial Kiai Mutamakin was found guilty, but later was granted pardon by King Pakubuwana II (1726-1749). The author of Serat Cabolek not only recorded the chronological details of Kiai Mutamakin's trial, more than that he also emphasized his stance on how the Javanese should direct their religious orientation. Yasadipura I, as a court poet with educational background of pesantren (Islamic boarding school), figured Ketib Anom as an ideal Javanese Muslim. This religious head officer from Kudus is a figure that perfectly described not just having in-depth knowledge of traditional Javanese mysticism, namely the mystical story of Dewaruci, but also mastering and carrying out the provisions of the Shari'a in Islam.

Livelihood strategies of two small-scale fisher communities: adaptation strategies under different fishery resource at southern and northern coast of Java

Small-scale fishers are frequently exposed to a variety of hazards that threaten their livelihood. Different socio-cultural, natural resource, environment conditions potentially create unique vulnerability and livelihood strategies which may exist in different places. Therefore, an investigation in two different fishing communities was carried out to understand the similarities and different of livelihood strategy works in both places. The study was conducted in two small scale fisheries community in village Betahlawang (north of java) and Glagah (south of Java). This research aims to describe livelihood aspects and strategies of fisher communities in both locations under different fishery resource and their dependency on the fishery through systematic surveys. The study showed that both communities are highly dependent on natural capital which mainly the abundance of the fishery resources. Others factors affecting both communities’ sustainable livelihood are the uncertainty in catch, weather and policy, limited capital ownership, access, and knowledge and skills other than fishing. Although the two study sites share some capital similarities, the livelihood vulnerability and their strategy is different. Betahlawang fishers more vulnerable than Glagah fishers because Glagah fishers has more diverse livelihood alternatives.

The Impact of the Interaction between Madden-Julian Oscillation and Cold Surge, on Rainfall over Western Indonesia

The Madden-Julian Oscillation and Cold Surge phenomena have been known to cause increased rainfall, with the capacity to trigger hydrometeorological disasters, in western Indonesia. However, further investigations are required regarding the interaction between these phenomena on rainfall pattern. Therefore, this study aims to analyze the interaction between MJO and CS over western Indonesia, particularly by using land-based rainfall observation data from multiple stations, as previous studies were dominated by the use of gridded data from remote observations. This study utilized in-situ observation data obtained from 4329 weather observations and rain stations between 1989 and 2018. Subsequently, quality control performed based on data availability exceeding 70% over a 30-year period resulted in 303 selected stations to be used for further analysis. Meanwhile, the RMM index, as well as reanalysis data of mean sea level pressure and 925 hPa meridional wind, were also applied for MJO and CS identification. According to the composite analysis, the effect of CS on MJO phases tends to increase precipitation by about 50%, over western Indonesia, with maximum increase ranging from 200 to 400% over the northeastern coast of Sumatra, around Karimata Strait (Riau Islands and West Kalimantan), as well as the northern coast of Java. These areas are exposed to the sea and have direct access to the wind-terrain interaction. In addition, the highest rainfall anomaly due to the MJO-CS interaction occurs around Karimata Strait, followed by northern Sumatra and Java, with spatially averaged rainfall anomaly reaching 5 mm/day over the area.

Effectiveness and impact studies of mangrove rehabilitation in the northern coast of West Java: A case study in Karawang Regency

Plenty of mangrove rehabilitation programs have been implemented on the northern coast of Java, including in Karawang Regency, both by the community and private companies’ participation through Corporate Social Responsibility (CSR). Over ten years, millions of mangrove plants have been planted. However, the results and impacts on the ecology and socio-economy have not been widely evaluated. An assessment and evaluation of the mangrove rehabilitation were carried out to determine the mangrove rehabilitation program’s results and effectiveness. This paper aims to determine rehabilitation’s condition and its impact on ecology and socio-economic surrounding the rehabilitation area. Mangrove rehabilitation activities at the northern coast of Karawang Regency have been provided new evidence that planting mangroves for rehabilitation purposes can not be seen as tree planting activities only. However, the impact and multiplier effects of its extraordinary benefits have not been paid much attention. Rehabilitation results have provided significant results, seen from the increase in the mangrove area, ecosystem quality, and positive impacts on ecology and significant socio-economic impacts indirect impacts, secondary impacts or cumulative impacts. It is necessary to develop and utilize rehabilitation results through a good socio-economic and institutional development approach to impact the community positively.

Ecobiology of horseshoe crab in Brebes, Northern Coast of Java: Preliminary study

Horseshoe crabs are known as living fossils and three species are found in Indonesia where all of them are being protected. The research aimed to assess ecology, species composition, and biological aspects in Brebes estuary. The research was conducted in August and October 2017 in Brebes Estuary. Samples were caught using local fishermen and experimental gears. Parameters of water quality were observed insitu and substrate was analyzed in the laboratory. The horseshoe crabs were measured morphologically, their stomach and eggs were taken to be analyzed in the laboratory. Total specimens of horseshoe crabs were 33 individuals (Tachypleusgigas=8; Carsinoscorpius rotundicauda=25). T. gigas has 16.3-22.6 cm of prosomal width and 216.1-717.0 gram of weight. C. rotundicauda has 11.2-14.5 cm of prosomal width and 96.0-275.5 gram of weight. Stations with a muddy sand substrate (silt >50%) have the highest number of captured horseshoe crabs. Food habits of T. gigas are macrophytes and detritus while C. rotundicauda are macrophytes, molluscs, annelids, and coral. Niche breadth of C. rotundicauda were wider than T. gigas. High niche overlap value between T. gigas and C. rotundicauda indicates high competition in utilizing food sources. The fecundity of C. rotundicauda was higher than T. gigas but the egg diameter of C. rotundicauda smaller than T. gigas.

Pengaruh Regenerasi Kota Terhadap Kualitas Lingkungan Permukiman Industri Kecil Batik Studi Kasus: Kawasan Pabean, Kota Pekalongan

The development of Pekalongan city is rapidly due to its strategic location in the northern coast of Java and the establishment of a world heritage of Batik, so that it gives an influence on all aspects, especially social and economic. Pabean as one of the centers of the home-based batik industry in Pekalongan also played a role in the development of batik, but the existence of the tidal disaster coupled with the lack of conscious entrepreneurs in waste processing has made settlements at customs in a declining environmental quality. Regional recovery programs have been present with the aim of returning the function of settlement infrastructure and facilities in Pabean. This study seeks to examine how much influence the urban regeneration has on the quality of the residential environment in Pabean. by using multiple linear regression analysis using three independent variables which are the concept of urban regeneration, namely social relations of the community, participation of the private sector and the government in maintaining environmental quality, and the relationship between the public and private sector and the government towards the dependent variable of the quality of the settlement environment is obtained by the effect of 14, 29 percent.Keywords: urban regeneration, pekalongan, batik, Pabean

Social Transformative Movement of Ulama and Pesantren in the Northern Coastal Java: Study of the Struggle of the Kyai to Promote Tradition, Economy, and Moderation of Islam

This field research seeks to analyze various developments and changes in the world of pesantren in the midst of changing societies and dynamic national political struggles. The kiai and pesantren institutions in the Indonesian context and the northern Javanese pesisiran in particular have various strategic roles both in the religious education sector which also guides the views and behavior of the surrounding community. In this research, it is seen from a socio-anthropological perspective with a choice of qualitative approaches. The data were collected through the observation by staying at the research location for several months, as well as interviewing the kiai, asaatidz, teachers at the pesantren, as well as several community leaders. Some historical data and others were obtained through documentation and search of other related literature. The findings of this study include the first presence of kiai with pesantren in northern coastal (pesisiran) Pati of Central Java, which has made many transformative social contributions to the surrounding environment. Both, historically, the pioneering of da'wah and the transformation of the pesantren, have been initiated by the kiai since the era of the struggle for independence, from kiai Salam, kiai Mahfudz to kiai Sahal struggle era and the young kiai in Islamic boarding schools in the Pati region, the northern coast of Java. The three Islamic boarding schools with social capital owned by the kiai (in the form of networking, norms, and trusts) not only play a role in interpreting and dialoguing the traditional values of Islamic teachings, but also maintaining and providing a role model for moderate Islam, in the empowerment movement of socio-religious, socio-education and socio-economics, even the socio-politics of contemporary society.

Analysis of the 15 December 2017 Mw 6.5 and the 23 January 2018 Mw 5.9 Java Earthquakes

ABSTRACT The west part of Java sits at the transition from oblique subduction of the Australian plate under the Sunda block of the Eurasian plate along Sumatra to orthogonal convergence along central and eastern Java. This region has experienced several destructive earthquakes, the 17 July 2006 Mw 7.7 earthquake and tsunami off the coast of Pangandaran and the 2 September 2009 Mw 7 earthquake, located off the coast of Tasikmalaya. More recently, on 15 December 2017, an Mw 6.5 earthquake occurred off the coast near Pangandaran, and, on 23 January 2018, an Mw 5.9 earthquake occurred offshore Lebak, between Pelabuhan Ratu and Ujung Kulon. Ground shaking and damage occurred locally and in Jakarta on the northern coast of Java. In this study, we use the double-difference technique to relocate both mainshocks and 10 months of seismicity (228 events) following the earthquakes. The relocation result improved the mainshock locations and depth distribution of earthquakes. Moment tensor of the December 2017 event located the hypocenter at ∼108 km depth within the subducting slab. The best-fit relocation places the depth at 61 km, close to the slab interface. Aftershocks occur between 68 and 86 km depth and align along a steeper plane than slab geometry models. The January 2018 event is located at ∼46 km depth. Aftershocks form a near-vertical, pipe-like structure from the plate interface to ∼10 km depth. A burst of aftershocks immediately following the mainshock shows a shallowing upward trend at a rate of ∼2 km/hr, suggesting that a fluid pressure wave released from the oceanic crust is causing brittle failure in the overriding plate, followed by upward migration of fluids. Five months later, shallow (<25 km) seismicity collocates with background seismicity, suggesting the January 2018 event activated the Pelabuhan Ratu fault system close to the coast.

Remotes sensing capabilities on land subsidence and coastal water hazard and disaster studies

Lowering on land surface which is commonly known as land subsidence is quite an issue in Indonesia today especially for coastal low elevation young sediment area, including cities or urban area lies on top of it. Jakarta is one of the city with most famous for land subsidence at the moment. If we go along northern coast of Java, many cities are experiencing the same situation as Jakarta and even more. As the impact from land subsidence, those coastal areas may experience water disaster such as sea water inundation and intrusion, wider expansion of flood and aquifer damage. Investigation of such areas in large and even regional scale with limited research budget is a problem. Nevertheless we found way for at least reducing the problem by using the capabilities of remote sensing product, geological and geostatistic data. We can identify land subsidence, coastal effected by subsidence like mentioned above by only time series of satellite image archive such as Google earth or Landsat free distributed, geological map and published geostatistic data like water consumption and population growth, with sample validated by land subsidence measurement and groundwater monitoring points. This paper will highlight our finding.

Integrated Multi-Trophic Aquaculture (IMTA) as a Solution for Shrimp Aquaculture Side Effects on Northern Coast of Java, Indonesia

Along the northern coast of Java, Indonesia, shrimp aquaculture has been one of the main sources of income for coastal communities. Considering its benefits, not only does these aquaculture activity invite stakeholders to establish large-scale aquacultures, but it also triggers local people to set up family-scale aquaculture on their house yards. This practice, however, gradually aggravates the environmental and ecological aspects of the coast as there is no significant environmental impact assessment either by the players or by the municipality. Meanwhile, Integrated Multi-Trophic Aquaculture (IMTA) has been suggested to be able to overcome environmental and ecological side effects of aquaculture activities. In addition, IMTA can be beneficial for local people as the use of lower trophic organisms, such as mussels and seaweed in this method can be a source of livelihood. Pursuant to these facts, the implementation of IMTA is crucial for the environment, ecology and economic states of aquaculture in the northern coast of Java.

Groundwater Change Detection by Gravity Measurement on Northern Coast of Java: A Case Study in Semarang City of Central Java of Indonesia

Northern part of Semarang city is affected by tidal flood due to land subsidence. Land subsidence is triggered by soil compaction and massive groundwater extraction. One of famous methods in analysing groundwater is gravity method. This research aim to present groundwater change in Semarang city based on gravity measurement and to analyze problems related to equipment and groundwater behaviour. Gravimeter Scintrex CG-5 was applied for gravity measurement. Geographic coordinates were measured using GNSS receiver namely TopCon HiperII. This research occupied SRTM90 Plus and regional geology map at 1:100.000 scales. Groundwater change was detected by differentiating simple Bouguer anomaly of 2014 and 2016. Data in gravity unit were then converted by coefficient of 0.012 mgal per meter. Simple Bouguer anomaly in 2014 ranged from -3.423 mgal to 19.874 mgal, while 2016 data ranged from -3.427 mgal to 19.835 mgal. Discrepancy of gravity anomaly ranged from -0.326 mgal to 0.209 mgal. The data confirmed that groundwater change ranged from -27.160 m to 17.408 m. Groundwater depletion occurred commonly on alluvial plain in northern area, while recharging could be found in some locations in southern part. This research concluded that gravity measurement had potential to be applied for groundwater detection in coastal areas.

Effects of Chlorella sp. Additions on the Changes of Visceral Mass and Proximate Contents of Shellfish

Shellfish, called as kerang in Indonesia, contains animal protein that’s popular, making it as and important fisheries and marine commodity. Supported by the good taste and high nutrient content in it. Paphia undulata or Kerang Batik, Peryglipta reticulata or Kerang Kemiri, Meretrix meretrix or Kerang Tahu, and Codakia tigerina or Kerang Madu, are consumption shells from northern coast of Java. To improve the quality of shellfish, Chlorella added as shellfish food preferences. It supported by the high nutrient content in Chlorella sp. Shellfish kept for 15 days in a basket with a sand substrate and drainage from sea. Therefore, the water quality had been controlled for the changed of salinity and water temperature. Parameters used to see the improvement shellfish quality is the color changes on visceral mass and the changes of proximate content (moisture, protein, fat, carbohydrate and ash). This study proves the color changes on visceral mass and proximate content. The color change occurs on the visceral mass and the gills. The changes of viscerall mass occurs on kerang batik from white greyish to yellow while the more clearly gills occurs on kerang madu and kemiri. Meanwhile, the change of proximate shown by the increasing of protein and moisture on all the spesies while on the otherside the decreasing of carbohydrate and ash, but the increasing of fat only occurs on kerang batik and kerang madu. The higher proximate changes occur on kerang madu, where the ammount of moisture at 71,43 ± 0,03 %, the protein at 16,55 ± 0,02 %, the fat at 1,35 ± 0,04 %, the carbohydrate at 2,9 ± 0,03 %, and the ash at 8,09 ± 0,04 %. The conclusion of this research are kerang madu has the higher positive influences by addition of Chlorella, shown by the increasing of proximate contents and the clearly of gills. Keywords : addision of Chlorella sp., changes of visceral mass, proximate, shellfish

JAVA COASTAL COMMUNITY EMPOWERMENT MODEL

: Speaking of the northern coastal communities of Java (Pantura), the first thing that comes to mind is the fishing community. The fishing community has always been an interesting object to learn. This is because the condition of the fishing area is different from the natural resources (SDA) of the sea owned by the northern coast of Java. The fishing area is always synonymous with poverty and backwardness in the midst of abundant marine wealth. However, this hypothesis is not entirely true, because not all northern coastal areas of Java are in that condition. This is of course because each region has different policies and concerns from the government of the shelter, but the most important factor is the willingness and determination of the local people in the northern coast to empower themselves. Keywords: Empowerment, Communities, Coastal, Java

Java Coastal Community Empowerment Model

Speaking of the northern coastal communities of Java (Pantura), the first thing that comes to mind is the fishing community. The fishing community has always been an interesting object to learn. This is because the condition of the fishing area is different from the natural resources (SDA) of the sea owned by the northern coast of Java. The fishing area is always synonymous with poverty and backwardness in the midst of abundant marine wealth. However, this hypothesis is not entirely true, because not all northern coastal areas of Java are in that condition. This is of course because each region has different policies and concerns from the government of the shelter, but the most important factor is the willingness and determination of the local people in the northern coast to empower themselves.

Analysis Comparison of Algorithms for Determination Concentration of Chlorophyll-a in Traditional and Intensive Milkfish Ponds Using LANDSAT 8 Images

Indonesia is an Archipelago Country because the Country of Indonesia consists of many islands stretching from Sabang in the west to the island of Merauke on the east. The Archipelago Country also comes from the old name of the Indonesian Country called Nusantara, because Nusantara is a country that consists of many islands. Indonesia is an Archipelago Country which means it has potential resources in the coastal areas, one of which is found on the northern coast of Java. The coastal area is an important area to be reviewed, one of which is the use of coastal resources by paying attention to the condition of the ecosystem that remains stable. Opportunities for coastal area utilization in the field of fisheries are in the form of fishing activities or fish farming, especially pond cultivation activities. Based on data from the Department of Marine and Fisheries of the Province of Central Java in 2010, pond cultivation is one of the potential resources on the coast. This potential is supported by the government to increase fish production in order to increase the consumption of fish in the community. Therefore, it is necessary to choose the most effective method of pond cultivation between traditional methods and intensive methods to optimize fish production. One indicator of effectiveness between the two methods can be seen from the phytoplankton distribution. Phytoplankton contains chlorophyll-a in the body and is a natural food from fish. Phytoplankton provides important ecological functions for the aquatic life cycle by serving as the basis of food webs in water. Phytoplankton also functions as the main food item in freshwater fish culture and seawater fish cultivation. Therefore, it is necessary to know the chlorophyll-a concentration in the ponds of traditional and intensive methods to determine the concentration chlorophyll-a of the two pond methods. One method used to determine the concentration of chlorophyll-a using remote sensing technology. Remote sensing technology can be used to determine the concentration of chlorophyll-a using the Wouthuyzen, Wibowo, Pentury, Much Jisin Arief and Lestari Laksmi algorithms. The results showed that the Pentury algorithm was relatively better to determine the concentration of chlorophyll-a in shallow waters (ponds). The lowest concentration of chlorophyll-a in traditional ponds is 0.47068 mg/m3, the highest concentration is 1.95017 mg/m3 and the average concentration is 1.12893 mg/m3, while in intensive ponds the lowest concentration is 0.36713 mg/m3, the concentration the highest is 3.17063 mg/m3 and the average concentration is 1.53556 mg/m3.

Corrosion Behavior of Mild Steel in Seawater from Northern Coast of Java and Southern Coast of Bali, Indonesia

The corrosion behavior of mild steel in seawater was investigated using an immersion test and energy-dispersive X-ray spectroscopy in solutions from the sites of Muara Baru, Suramadu and Tol Mandara. As reference, solutions of 3.5% and 5% NaCl were prepared. Dissolved oxygen, salinity, conductivity, and total dissolved solids (TDS) were measured. It was found that uniform corrosion occurred on the mild steel during the immersion test. The corrosion resistance of the steel decreased with increasing exposure time. Since the magnitudes of conductivity, salinity and TDS of all test solutions were similar, it was concluded that dissolved oxygen (DO) and chloride ions play an essential role in inducing the corrosion risk of mild steel. Both parameters hinder the formation of a stable passive film on the surface of corroded mild steel.

Social Transformation in the Northern Coastal Cities of Java: a Comparative Study in Cirebon and Gresik

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KERAGAMAN IKTIOFAUNA MUARA SUNGAI CIMANUK, INDRAMAYU, JAWA BARAT

Cimanuk river, which the estuary formed a delta, is a habitat for many fishes that occupied the water in northern coast of Ja va. The estuary is essential for supporting the fish life cycle. The aim of this study was to asscess the diversity of ichthyo fauna in Cima nuk River estuary. The fishes were collected in three months from July to September 2013 at three locations: Pagirikan, Pabean Ilir and Song. Total fish collected were 1,826 individuals, consisted of 103 species from 41 families and 14 orders. Most of them were from Family Ambassidae,Leiognathidae, Scianidae, Gobiidae, and Ariidae.

The role of spatial planning in reducing exposure towards impacts of global sea level rise case study: Northern coast of Java, Indonesia

Spatial planning is expected to facilitate climate change adaptation by directing future spatial and infrastructure developments away from zones that are exposed to climate-related hazards. This study attempts to confirm this understanding by mapping the effects of the various spatial plans on the northern coast of Java, Indonesia. First, the study maps the extent of coastal hazards for the baseline year of 2010 using a GIS-based inundation model. An overlay in GIS demonstrates the influence of spatial plans for the projection year of 2030. This allows for calculating the economic losses of the planned developments. The case study shows that the current provincial spatial plans direct land use conversions along the northern coast of Java to continue to occur in the future. This could significantly decrease the regional capacity in dealing with the exposure to coastal inundation. The analysis also demonstrates that a total area of 55,220 ha of land prone to inundation, consisting of protected area (1488 ha), fishponds (32,916 ha) and agricultural land (20,814 ha), is planned to be converted into industry (13,399 ha) and settlements (41,821 ha). Thus, these areas will be also prone to inundation in 2030. This change would potentially lead to an economic loss of 246.6 billion USD. The spatial plans issued by the national and provincial governments for regulating the future land use on the northern coast of Java have not integrated measures against hazards related to global sea level rise. Meanwhile, many existing developments have already been affected by coastal inundation. Rather than reducing the exposure towards coastal flood hazards, the case study shows that spatial plans could even increase the risk of climate-related hazards and cause higher economic losses. These findings provide a different perspective on the role of spatial planning for climate change adaptation than what is stated in the literature.