bluuebunny/crossref_metadata_2025_split huggingface dataset:
Landslide Susceptibility Mapping in Jurangjero and Kampung Villages, Ngawen Sub-District, Gunung Kidul Regency, Special Region of Yogyakarta, Indonesia
Authors: Manyvanh B , Setiawan H 
Published: October 2023

Abstract
Jurangjero and Kampung villages are one of the areas in the Ngawen sub-district, Gunung Kidul Regency, Special Region of Yogyakarta, Indonesia. The research area is located in the Southern Mountain regionally, especially the Baturagung Sub-Zone. This area is part of The Baturagung Hills, dominated by weathered andesite breccia, tuff, sandstone, and limestone. The topography of these hills can be divided into three slopes, 15-30%, 30-45%, and more than 45%. A soil movement event happened in Jurangjero Village, the biggest, on January 15, 2020, which caused heavy damage to people’s homes, road damage, and breaking bridges. Geographic Information System (GIS) and Analytic Hierarchy Process (AHP) model were applied to identify landslide conditioning factors and produce the landslide susceptibility map. Four conditioning factors including slope, lithology, faults to distance, and land use, were combined using ArcGIS 10.8 to create the landslide susceptibility map of the research area. The research area is divided into four landslide susceptibility zone very low, low, moderate, and high, with each zone of 36%, 20%, 41%, and 3%, respectively. A significant percentage (3%) of the research area with high landslide susceptibility is located along the steep slope, showing the landslides’ locations.
Social Vulnerability Analysis to Disaster COVID-19 in Central Java
Authors: Qomariyah N , Mei E T W 
Published: October 2023

Abstract
The COVID-19 disaster has socio-economic impacts in various regions, including Central Java. COVID-19 has the potential to exacerbate social vulnerability due to the limited internal conditions of individuals to survive. This study tries to analyze social vulnerability based on indicators of individual conditions demographically, socio-economically, and the ability to access service facilities which can be exacerbated by the potential danger of COVID-19. This study aims to analyze the level of social vulnerability and the spatial and temporal distribution of the COVID-19 disaster in Central Java. This study uses a quantitative analysis method by calculating Principle Component Analysis (PCA) and Social Vulnerability Index (SoVI) to identify the level of social vulnerability in Central Java. Analysis of the level of the COVID-19 disaster uses cumulative positive case data which is analyzed spatially and temporally using ArcGIS. This study shows that the higher the SoVI value in a region, the higher the level of individual social vulnerability in that region. The results showed that the highest level of social vulnerability to the COVID-19 disaster in Central Java was the cities of Semarang, Cilacap and Banyumas which were influenced by the conditions of individual vulnerability and the number of positive cases of COVID-19.
Understanding Kulon Progo through Historical Maps
Authors: Cahyono A , Susilo B , Wirasanti N , Rahardjo N , Albadara Y O S , Berlyanti M C 
Published: October 2023

Abstract
Kulon Progo Regency, part of the Special Region of Yogyakarta, has undergone political and administrative divisions, thereby leading to a dynamic geographical name change. Presently, this regency does not yet have a database for geographical names, which are part of cultural heritage to reveal historical events. Therefore, this study aims to conduct an inventory of geographical names in the Kulon Progo Regency through multitemporal historical maps and interpret their meanings. The inventory was carried out by digitizing scanned topographic maps stored on the Leiden University repository website and interpreting the meaning of geographical names through dictionaries and history books. Inventory using historical maps is an effective method of revealing past events. The result found that physical geographical names dominated 78 or 54% of villages, with 45%, 35%, and 20% consisting of biotic, non-biotic and topological aspects. Meanwhile, non-physical geographical names comprised 61 villages, incorporating 26%, 8% and 10% social, economic and cultural aspects.
The Utilization of Geographic Information Systems for Settlement Location Determination in Supporting Sustainable Development: Study Case in Sedayu Sub-District, Bantul Regency, DIY
Authors: Nur Awalia N. , Luklu Chusnia D. , Fajar Nugroho S. , Bayu Sekaranom A. 
Published: October 2023

Abstract
The phenomenon of unsuitable settlement becomes a major issue in environmental problems in big cities. The purpose of this study is to provide innovation design recommendations for determining the location of appropriate settlements to realize the implementation of smart cities. The resulting output of this study is an innovation in settlement location determination. The innovation using a geographic information system equipped with a variety of spatially processed information with overlay techniques. The results of the geographic information system process are then extracted into a mobile application design. Study case in Sedayu District show that the area consists of 36.9% of the area is not suitable for analysis; 36.4% of the area is not suitable for use, and 26.7% of the area is suitable for use. Mobile application design in this study called Smart Application for Smart Resident with two main features, My Contribution (KOKU) and Recommendations and Settlement Locations feature. This innovation can help the community by providing information and recommendations for suitable, less suitable, and unsuitable settlement locations. Thus, the existence of the result study can be a consideration of the community in determining the location of settlements by aspects of sustainable development.
Management of Springs in Pluneng Village, Kebonarum, Klaten
Authors: Khasanah N , Purnama S 
Published: October 2023

Abstract
Springs are one of the most important natural resources for some people. Springs are often used as the main water source to meet household needs. In Pluneng Village, Kebonarum District, Klaten Regency, there are two springs that are very important for the surrounding community, namely the Tirtomulyono Spring and the Tirtomulyani Spring. The purpose of this research is to formulate a management strategy for the two springs that is in accordance with the conditions of the area. This research is analytical descriptive using survey method. Collecting data by interviewing local community leaders and field observations. The spring management strategy is to define and analyze the spring protection zone, namely the spring point protection zone, the spring protection zone from contaminants in the form of pathogenic bacteria, and the water catchment area protection zone. In addition, if the two springs will be used for domestic water requirement, treatment should be carried out first because the total coliform bacteria for both springs do not meet the quality standards.
Preliminary study of isotope characteristics of groundwater in karst hydrogeology in Pacitan Regency, East Java
Authors: Anggraeni T , Putra D P E , Taufiq A 
Published: October 2023

Abstract
The Pacitan Karst region is well known to be one of drought area in the Pacitan Regency during the dry season. Consequently, during the dry season, springs from karst system are required as a water source for the daily life. The appearance of these springs are a result and advantage of the karst terrain, which contains potential groundwater resources. The purpose of this study was to investigate the origin and characteristics of spring’s water in the Pacitan karst region based on its isotope concentrations. This research was conducted by collecting groundwater samples from springs, dug wells, bore wells, and rivers in Pacitan Regency and analyzing their 18O and 2H concentrations. Information on the source of groundwater is thought to be necessary for sustainable groundwater protection planning (conservation). According to the results of the investigation, there are four categories of isotope ratio distribution. The pattern of 18O and 2H concentrations in the samples around the Local Meteoric Water Line (LMWL) shows that groundwater originates from the same elevation of the catchment area from where rainwater falls and has the same characteristics as rainwater or meteoric water.
The Study of Air Pressure System and Extreme Rain in The Southern Java Island
Authors: Manuhana R W , Sekaranom A B , Nurjani E 
Published: October 2023

Abstract
Extreme rain can trigger other natural phenomena that can interfere with human activities. Rain phenomenon extremes are common in tropical cyclones. This study aims to characterize the occurrence of extreme rain events concerning the air pressure system on Java Island. This study uses rainfall data from GSMAP MVK Product and Sea Level Pressure (SLP) from NCEP/NCAR Reanalysis. The identification of extreme rain is carried out with pixel detection of the GSMAP precipitation data from 2015 to 2019. The most extreme rain events were then ranked, and ten events with the highest rain rate were selected. The SLP data at the selected extreme rain event was analyzed and plotted as a map. The principal result shows that in the 10 highest extreme rain events, 4 of them occurred due to the influence of low-pressure systems and tropical cyclones. The rest are associated with other climatic phenomena. In conclusion, this study shows that extreme rainfall tends to be associated with low-pressure anomalies over the Indian ocean. However, not all of the low-pressure anomalies were intensified as a tropical cyclone. Therefore, extreme rainfall in Southern Java Island can be developed due to small air pressure differences.
Water Quality of Tirtomulyono and Tirtomulyani Springs, Klaten, Central Java
Authors: Khasanah N , Purnama S 
Published: October 2023

Abstract
Water quality is one aspect that is increasingly being considered in the management of water resources. In addition to the requirements regarding water quality that are more considered, currently there is a tendency for water pollution to occur in several water sources, including springs. The purpose of this study was to evaluate the water quality of the Tirtomulyono and Tirtomulyani springs in Kebonarum District, Klaten Regency, Central Java Province. To determine the condition of the water quality of the Tirtomulyono and Tirtomulyani springs, direct observations and water samples were taken. Direct observations in the field were carried out to determine physical parameters, while water samples were taken for analysis in the laboratory for chemical and biological parameters. The results showed that in terms of physical and chemical parameters, the quality of water in Tirtomulyono and Tirtomulyani springs was good because it met drinking water requirements. according to the Regulation of the Minister of Health No.492/Menkes/Per/IV/2010. However, based on the results of laboratory analysis, the Total Colliform value of the two springs is > 1600 MPN/100 ml even though according to the quality standard the Total Colliform value must be zero, so in terms of the Total Colliform value it does not meet the drinking water requirement.
Urban Risk Assessment in Heritage Area for Developing Resilience Understanding
Authors: Cahyandari Gerarda Orbita Ida , Worosuprojo Suratman , Mardiatno Djati 
Published: October 2023

Abstract
Heritage area is vulnerable to urban development. Risk and resilience were discussed separately, especially in a heritage area. The term urban risk describes the risk in an urban area. Main factors that link urban risk and resilience must be determined sequentially asa strategy to reduce urban risk and improve resilience. This paper was based on field observation and questionnaires distributed in Jeron Beteng Yogyakarta. The first questionnaires collected data from the owners or residents of heritage objects for addressing the basic risks assessment and social-community assessment. The second questionnaire on risk, resilience, and heritage was distributed to the surrounding communities of the heritage objects. The questionnaires were developed as an assessment for quantitative analysis. The scoring analysis revealed the essential roles of the government and the community in controlling urban risk and resilience. The multi-factors and multi-contexts have relations of interdependence and mutuality. Integrating urban risk and resilience must focus on government funds, professional assistance with renovation, and traditional authority. The social, economic, hazard-disaster mitigation, and building aspects are needed in inter-relationship with the factors. Governance factors must be prioritized in the strategy of preservation.
Activity of Lactic Acid Bacteria (LAB) from the intestines of vannamei shrimp (Lithopenaeus vannamei) in inhibiting the growth of Vibrio harveyi
Authors: Bayhaqi A , Insafitri  
Published: October 2023

Abstract
Lactic Acid Bacteria (LAB) is a bacterium that has been widely used as a probiotic because it can inhibit the growth of pathogenic bacteria. Lactic acid bacteria are usually found in the digestive tract of both humans and animals. In this study, isolates of Lactic Acid Bacteria from the intestines of vannamei shrimp (Litopenaeus vannamei) were isolated from traditional ponds in Bangkalan. Antibacterial activity testing was carried out on Vibrio harveyi, and then the suspected isolates of LAB were identified using a biochemical test referring to the book Identification of Cowan and Steel 1992. Isolation of LAB using pour plate using MRS Agar media enriched with CaCO3 1%. Antibacterial activity test using Kirby Baurer method with disc diffusion technique. The results of the characterization of LAB contained in the intestines of vannamei shrimp were obtained as many as four isolates. Antibacterial activity test of LAB against Vibrio harveyi obtained the highest inhibition zone, namely isolate 2 with a diameter of 4.25 ± 1.77 mm, and was included in the weak category because it was less than 5 mm. The results of bacterial identification using biochemical tests showed that the three isolates were bacteria from the genus Pediococcus and one isolate was a bacterium from the genus Gemella.
Application of algorithm model for estimating shallow-water bathymetry in Tidung Island, Seribu Island using sentinel-2A satellite image
Authors: Maulidya Q , Arhatin R E , Susilo S B 
Published: October 2023

Abstract
The comparison and application of log-linear transformed and log-ratio transformed algorithm models to produce shallow marine bathymetry maps on Tidung Island, Seribu Islands, and Jakarta are still not widely studied. This study aims to compare and apply the better algorithm model in mapping shallow water bathymetry on Tidung Island, Seribu Islands. The goodness of fit tests (determination test and chi-squared test) are used to see the level of suitability of the model in mapping shallow water bathymetry. The result shows that there is a tendency for the log-ratio transformed algorithm to be the better model compared to the other algorithm for mapping bathymetry in Tidung Island, Seribu Islands, with a determination value (R2) of 0.58 and a chi-squared (X2) value of 2.08. In contrast, the log-linear transformed model has an R2 value of 0.57 and X2 of 2.17. This result is in accordance with the initial study of ocean color remote sensing (OCRS) development. The log-ratio transformed algorithm is therefore used to map shallow water bathymetry on Tidung Island, Seribu Islands, using the combination of blue, green, and hand a range of 0 – 6 meters.
Physical and chemical characteristics of Socah Estuary, Bangkalan
Authors: Jayanthi O W , Kartika A G D , Nuzula N I , Syaifullah M 
Published: October 2023

Abstract
Dominating the hydrodynamic influence of seawater and the entry of freshwater runoff from the land causes the estuary to have dynamic physical and chemical composition characteristics. The estuary area has fluctuating ecosystem changes caused by the many activities in the estuary. This study aims to determine the physical and chemical properties of the Socah River Estuary. Data were retrieved in situ at 4 station points 3 times a row. Physical and chemical parameters were measured three times. The analysis shows that each station’s temperature value is 28.5 – 30.3°C, the transparency value is 12,5cm – 30cm, the turbidity value is 13 – 25 NTU, and the TSS value is 13 mg/L – 16 mg/L. While the chemical parameters of the estuary showed the salinity concentration was between 20-22 ppt, the pH value was 6.8-7.5; the DO concentration was 2,7 mg/L - 4 mg/L, and CO2 concentration was 0,8 ppm – 2,4 ppm. Variations of water quality characteristics at each station were analyzed using Principal Component Analysis (PCA). The PCA obtained two main analysis components; 75,5% of the total variance is related to CO2, temperature, TSS, and transparency parameters.
Characteristics of North Pacific water masses in the Bali Sea
Authors: Khalishah P V , Naulita Y , Hernawan U 
Published: October 2023

Abstract
The Bali Sea is the trajectory of Indonesian Throughflow (ITF)’s water mass which originates from the North Pacific (NP) Ocean before exiting through Lombok Strait. Therefore, the NP water masses have an impact on the characteristics of the water mass in this area. The study aims to describe the stratification and structure of water masses and calculate the contribution of North Pacific Subtropical Water (NPSW) and North Pacific Intermediate Water (NPIW) using Optimum Multiparameter (OMP) analysis. Stratification of the Bali Sea consists of mixed, thermocline, and deep layers. There were found remnants of NPSW and NPIW inside the thermocline layer, deeper than their origin in the NP Ocean. The core layer of NPSW has an S-max value of 34,6 psu at 120-170m depth, while NPIW has an S-min value of 34,3 psu at the deeper layer, 260-280m depth. The NPIW more dominant presence in the Bali Sea with 80% contribution at a depth of 200-215 meters, while NPSW contribution is 70% at a depth of 110-130 meters. NPSW’s contribution decreases from east to west and vice versa the NPIW.
The phenomenon of Harmful Algae Blooms (HABs) based on literature study in Indonesia Sea Waters from 2005-2021
Authors: Samudra S H , Ghofari M A , Ismet M S , Fikri R A N , Sudrajat J C S , Azalia F , Sardi F D , Rifqi M , Maysaroh S , Febridelita A , Setyaningsih W A 
Published: October 2023

Abstract
Phytoplankton plays a vital role as a significant component of the food chain and primary production in the marine environment. However, the blooming of certain phytoplankton can have a detrimental impact on aquatic ecosystems. Toxins produced by these algae can be harmful to humans and animals. This study aims to map the spatial and temporal distribution of harmful phytoplankton in the sea waters of Indonesia. The study uses literature published from 2005 to 2021 about harmful algae blooms in Indonesia. This literature is then analyzed by reviewing existing literature from reputable repositories, with the keyword harmful algae blooms in Indonesia, and visualized using R. The study results show two phyla of phytoplankton most commonly found in the waters of the Indonesian Sea, namely Ochrophyta and Myzozoa. Seventeen genera were identified as potentially harmful phytoplankton (Chaetoceros, Coscinodiscus, Pyrodinium, Nitzschia, Skeletonema, Thalassiosira, Trichodesmium, Alexandrium, Rhizosolenia, Pseudo-Nietzsche, Ceratium, Dinophysis, Noctiluca, Protoperidinium, Prorocentrum, Anabaena, and Oscillatoria), with ten of them known to be potentially toxic (Nitzschia, Cochlodinium, Trichodesmium, Alexandrium, Dinophysis, Pyrodinium, Protoperidinium, Prorocentrum, Oscillatoria, and Anabaena). The most affected areas by harmful algae blooms (HABs) in Indonesia are in western Indonesia, especially the southern part of Sumatra, Lampung, and DKI Jakarta. The analysis of the causes of HABs shows that excess nutrients, as well as domestic and anthropogenic wastes, are the leading causes of the HABs phenomenon in Indonesia.
A cost benefit analysis of blue swimming crab gillnet fishery in Pangkajene Island, South Sulawesi
Authors: Welis M , Satria M B , Nugroho K C , Setioko W 
Published: October 2023

Abstract
Blue swimming crabs (Portunus pelagicus) are an important capture of the gillnet fisheries practiced around Pangkajene waters. The fisheries have been monitored by the Indonesian Blue Swimming Crab Association (APRI) by deploying enumerators who collect some data on the volume and size of crabs captured by fishermen. Information on the economic aspect of the fisheries, i.e., the business feasibility, has not been studied. The method in this study is observation and interviews. Based on monitoring data for 5 fishing units, the financial performance of the crab fisheries was evaluated. The fishing units were selected on the basis of records on eligible crabs. The available data collected from June 25th to July 5th, 2022, were processed and analyzed for calculations of business profit/loss analysis, benefit-cost ratio (B/C), break even point (BEP), and payback period (PP). The results showed that the blue swimming crab-catching business using net fishing gear is, on average feasible and profitable fishing gear with a Benefit Cost Ratio value of 1.36. Based on the calculation of the pay pack, the average period is 1, which means that fishermen only need one year to return the total capital. It is concluded that the crab fishing business is generally feasible financially.
Vertical and horizontal distribution model of lead (Pb) in Padelegan Waters, Pademawu District, Pamekasan Regency
Authors: Hariyanti A , Kartika A G D , Jayanthi O W , Wicaksono A , Nuzula N I , Efendy M 
Published: October 2023

Abstract
Seawater quality is importantly used in salt production, but it could be contaminated due to input of anthropogenic wastewater. This study aims to understand the quality of the water and the content of Pb in seawater, which will be used as raw material for salt production. Descriptive research methods and purposive sampling methods were used for the research method and the determination of the sampling respectively. Sampling of seawater was carried out water sampler, followed by analysis of heavy metal Pb based on APHA 1998 using Atomic Absorption Spectrophotometry (AAS). The concentration of Pb on the surface ranged from 0.6332 to 1.0815 mg/L, in the water column from 0.5842 to 1.0516 mg/L, and in the bottom waters from 0.5571 to 0.9375 mg/L, according to the findings. The horizontal distribution of the Pb showed an increasing trend towards the sea with concentrations ranging from 0.6332 to 1.0815 mg/L. Meanwhile, the concentrations of Pb in surface waters increased vertically, ranging from 0.5571 to 1.0815 mg/L. The horizontal distribution is higher towards open sea, while vertical distribution is higher towards the water surface. Seawater in vicinity of study area is still probably used although caution must be observed regarding to the Pb content.