bluuebunny/crossref_metadata_2025_split huggingface dataset:
Distributions of Chromium, Copper, and Cadmium in the estuary-coastal surface sediment of Tin-Rich Island
Authors: Nurhidayati A U , Cahyarini S Y , Utami D A 
Published: October 2023

Abstract
Belitung Island known as one of the tin producer in the world, as it lied in the South East Asian tin belt. The study was conducted in the North Belitung Island to investigate some metal elements concentration of sediment along the estuary river and coastal area near to carbonate reef environment system. Thirteen sediment samples were collected from estuarine riverbed, shoreline, and offshore of North Belitung. The concentrations of metal elements were analysed to assess the environmental pollution characteristics by using flame AAS (Atomic Absorption Spectrophotometry) method. The result indicated that the average concentrations of chromium (Cr), copper (Cu), and cadmium (Cd) were 1.62-18.26, 5.72-80.07, and 1.4-4.59 mg/kg dry weight, respectively. The calculation of geo-accumulation index (Igeo) was adopted in this study to evaluate the heavy metal pollution. The Igeo values revealed that this research area has been moderately polluted by Cr and Cu, and unpolluted-moderately polluted by Cd. Based on the contamination level to adverse biological effect, the heavy metals concentration in this research area has the low potential to adverse biological effect by Cr and Cu, and low-moderately potential by Cd. This information is important to lead the study about any other elements and heavy metals to evaluate the risk assessment in the tropical area.
Cianjur Earthquake- Roles of Social Media and the Distribution of Sciences
Authors: Rudyawan A , Pamumpuni A , Puspaningrum M R , Gunawan I , Sapiie B , Handayani A P , Abdurrachman M 
Published: October 2023

Abstract
A magnitude 5.2 earthquake hit Cianjur Regency, West Java, Indonesia on November 21, 2022, killing more than 300 people, leaving many more missing, and damaging more than 60,000 houses which caused thousands of people to be displaced from their homes. Significant seismic activity was recognized in 1699, 1834, 1879, and 1900 near Cianjur in West Java. The news quickly hit social media, with some responding in group chats, feeds, reels, and literature reviews shared via other social media claiming that the Cimandiri Fault had caused the event. Moreover, discussions were featured in webinars and on national television. However, this information was based solely on limited information and prior knowledge of the area without further analysis of the actual data.
New satellite data was uploaded via social media a few days later. This update soon reduced online discussion about the Cimandiri Fault. There was further evidence of a previously buried fault between the Cimandiri Fault and the Gede Pangrango Range, 12 km north of the estimated location of the Cimandiri Fault. Our field observations indicate that this fault caused most of the rupture in this region.
Socially, the earthquake event also caused immediate problems in the local community. There have been incidents of earthquake survivors, donors, and people taking advantage of the situation. Blockades were everywhere, and those claiming to be survivors demanded that oncoming donation fleets be stopped, and all donations abandoned. These incidents have hampered efforts to distribute aid to the most remote areas. As a result, survivors who had taken refuge far from major logistical lines were left stranded. Heartless selfies and video content created in the face of grieving communities are everywhere and create a rift between survivors and donors.
The recent Cianjur earthquake has taught us how important it is to understand the geological phenomena behind our homes and the effect of information and misinformation via social media. While social media serves as a valuable tool for rapid information dissemination during disasters, verifying information from reliable sources and encouraging responsible usage of social media platforms is essential. Effective filtering of information becomes pivotal to combat misinformation in developing more resilient communities, safeguarding lives, and minimising the impact of the disaster.
Utilization of By-Products and Waste GGBFS Materials from Steel Processing Industry to Produce Sustainable Green Pervious Concrete in Indonesia
Authors: Kusumaningrum Patria , Risnan Muhammad 
Published: October 2023

Abstract
Pervious concrete is a reliable solution for environmentally friendly concrete pavements, especially for densely populated urban areas. Some of the benefits of pervious concrete to the environment are mainly increasing the absorption of water into the soil, so that it can quickly purify rainwater runoff, recharge groundwater, reduce rainwater runoff, and when combined with well-designed drainage system it can minimize the potential of flooding. The uniqueness of this concrete is that it uses few or no fine aggregate at all, with the main composition consisting of coarse aggregate, binder (cementitious/pozzolanic materials), water and admixture. The development of pervious concrete with steel slag as raw material as coarse aggregate and Ground Granulated Blast Furnace Slag (GGBFS) as a partial replacement for cement is carried out to address environmental problems caused by impervious pavement that is commonly used in urban areas, as well as to increase the added value of material by-products of the steel processing industry. The aim of this research is to obtain a pervious concrete mixture with an optimum compressive strength and porosity utilizing locally available by-products and waste materials from steel processing industry to produce a more sustainable construction material. Evaluation based on the experimental results shows that the specimen with well graded or blended-size of steel slag coarse aggregates, with a maximum of 10% steel slag fine aggregate, and GGBFS as 32% cement substitute material (CSM) is found to be an optimized mixture in achieving high compressive strength of 20.24 MPa at which both density and porosity values complying ACI 522R-10.
Review of morphological changes of Anak Krakatau before and after 2018 eruption using Aerial photogrammetry
Authors: Banggur Wilfridus F S , Pratama Aditya , Ismail Taufik , Nurfiani Dini , Prayoga Ardy Setya , Kartadinata M N , Syahbana Devy Kamil , Mardiono Deni , Bani Philipson 
Published: October 2023

Abstract
We carried out drones photogrammetry on Anak Krakatau in 2013, 2019, 2020 and 2021. Changes in the morphology of Anak Krakatau occurred so quickly as its volcanic activity never stopped. Its pyroclastic cone in 2013 reached a height of 334 meters with a coastline circumference of 6.8 km. The circumference of the pyroclastic cone calculated from the traces of the old crater wall has a volume of 31971 m3. During the 2018 eruption, a large part of the cone was pulverised, resulting in a large crater of 400 m in diameter. Paradoxically, while the top of the volcano has dropped to 156 m, the island-volcano has grown relatively large, with an additional circumference of 7.2 km. The body of Anak Karakatu has experienced an addition to the coastline, especially on the South, East and North sides. This happened due to the eruption and tsunami accompanied by avalanches during the December 2018 eruption. During the 2020 and 2021 eruption periods, the coastline has not changed. This period was marked by the growth of a pyroclastic cone in the crater that had formed previously during the 2019 eruption. The pyroclastic cone was opened to the southwest by lava flows that flowed westward as far as 600 meters.
Significant Precipitation Anomalies over Indonesia in the Aftermath of iod Events
Authors: Nasution Chairul Nazli , Fajary Faiz Rohman , Abdillah Muhammad Rais , Kartadikaria Aditya Rakhmat 
Published: October 2023

Abstract
Indian Ocean Dipole (IOD) is one of the prominent climate phenomena affecting Indonesia. The well-documented impacts of IOD are dry and wet anomalies during positive and negative IOD events, respectively, which are clearly detected during the development and mature phases of IOD in the boreal summer to autumn (June-November). IOD impacts on other seasons were questionable because of unclear associated signals. Here, we find significant precipitation anomalies in the aftermath of IOD events, which reach a peak in the following spring (March-May). The delayed pattern is distinctive with the typical impact of IOD. During positive IOD, the quick recovery and warming of IOD-induced sea surface temperature (SST) in the eastern Indian Ocean due to increasing shortwave radiation is suggested to play a role. When the influence of El Niño-Southern Oscillation (ENSO) is linearly removed, the aftermath impacts of IOD in the western regions appear to be suppressed because of weaker positive (SST) anomalies. While the eastern regions show anomalous increase on precipitation due to anomalous increase of convergence. This finding reveals the complex impacts of IOD and ENSO and may benefit to developing a better seasonal forecast over Indonesia.
Prediction of Convective Available Potential Energy and Equivalent Potential Temperature using a Coupled WRF and Deep Learning for Typhoon Identification
Authors: Tamamadin Mamad , Lee Changkye , Kee Seong-Hoon , Yee Jurng-Jae 
Published: October 2023

Abstract
To predict typhoons in the western North Pacific Ocean, it is required to predict the determinants of typhoon activities. The formation of the typhoon can be controlled by Convective Available Potential Energy (CAPE) and Equivalent Potential Temperature (theta-e). To predict the variables, a mesoscale numerical model of Weather Research and Forecasting (WRF) can be used. However, the output of WRF needs to improve to obtain a more accurate CAPE and theta-e prediction. This study uses a coupled WRF model and Deep Learning (DL) Multilayer Perceptron Regressor approach to increase CAPE and theta-e prediction skills. Simulation with dataset scenarios with WRF outputs as predictors and sounding data as predictors are developed and tested to obtain the most appropriate package of deep learning simulation. The study found that coupled models provide increased mean accuracy of theta-e and CAPE, namely 16.6% and 32.0% higher than using original WRF, respectively. This study also shows the difference of skill scores in the spatial distribution of CAPE and theta-e of WRF result and its coupled model.
Correlation Analysis of GNSS-Derived Precipitable Water Vapor (PWV) with Rainfall Data in Indonesia
Authors: Barbarosa Azhari , Wijaya Dudy D , Tanuwijaya Zamzam A J , Putri Nabila S E , Kuntjoro Wedyanto 
Published: October 2023

Abstract
GNSS (Global Navigation Satellite Systems) have become an important tool for various activities related to positioning, such as navigation, construction projects, and deformation measurement. Additionally, GNSS can also estimate Precipitable Vapor Vapor (PWV) for meteorological purposes. PWV is a measure of atmospheric water vapor, which can eventually precipitate as rain. Since Indonesia’s climate is mainly characterized by the change in rainfall, monitoring precipitation is a crucial step in understanding its pattern. In this study, we aim to analyze the correlation between PWV and rainfall in Indonesia. We used GNSS observations from the InaCORS network across Indonesia, as well as rainfall data from GSMaP at the InaCORS stations in 2019 from 1st January to 31st December. Both of these data are normalized every five days (pentad days) and compared to each other to obtain the Pearson’s correlation coefficients. From these results, we generated a heatmap of the Pearson’s correlation coefficients between pentad PWV and rainfall at InaCORS locations in Indonesia, with the highest correlation of 0.753819 in Garut Regency and the lowest correlation of 0.090146 in Fakfak Regency. Moreover, we also analyzed the timeseries of PWV and rainfall comparison at several sampling stations. From the results we found, PWV and rainfall correlate each other in positive way. Southern regions of Indonesia have higher correlation compared to northern regions of Indonesia.
Coastline Change using Time Series Satellite Images in the North Coast of Java: Study Case Indramayu Regency, West Java, Indonesia
Authors: Fauzunora Erva Aulia , Saepuloh Asep , Tarya Ayi 
Published: October 2023

Abstract
Coastal areas have continuous change due to the interaction between sea and land, which generally causes abrasion and accretion. Indramayu Regency has a coastline of around 147 km. Indramayu Coastal has the characteristics of a sandy beach with a dominant abrasion process triggered by digging beach sand and changes in the function of mangrove land into ponds. We applied remote sensing observation to obtain coastline data on a regular basis. Currently, satellite images support the availability of Landsat data in a relatively short time and cover a wide area. Landsat imagery has been used in the last ten years to detect coastline changes in study areas based on the BILKO and Digital Shoreline Analysis System (DSAS) methods. Abrasion in 2012 – 2022 covers an area of 805.71 ha and accretion covers an area of 941.63 ha. The widest abrasion is in Pasekan with an area of 266,451 ha. The abrasion process in Pasekan is very high due to the influence of high currents and waves from the sea, and the accretion process in Cantigi is very high due to the high supply from the Cimanuk River and the many mangroves that collect sediment that enters the sea.
Study of Driving Force and Surface Current Patterns in Labuan Bajo from High Frequency Radar data from October to December 2018
Authors: Baharsyah Y , Hakim A R , Ramdhani A , Rachmayani R 
Published: October 2023

Abstract
Surface ocean current data in Labuan Bajo from October to December 2018 for determine the characteristics of the surface current and identify the influence of wind and tides in generating surface current. The current data set is derived from measurements of high frequency (HF) radar, which operates on the electromagnetic wave spectrum at high frequency or short wave. Method of data analysis by processing surface current velocity and direction of the zonal and meridional into spatial and temporal graphs. The result showed the average current speed in October was 0.13 m/s, the average current speed in November was 0.12 m/s, and the average current speed in December was 0.09 m/s. The empirical orthogonal function (EOF) Mode 1 has a variance of 56.2% because of the tides, Mode 2 has a variance of 26.6% because of bi-weekly variability, and Mode 3 has a variance of 17.2% because of the intra-seasonal period. This shows that tides have a greater influence on the study region than any other driving force. These results are intended to be useful to the public, particularly in terms of sustainable coastal marine management in Labuan Bajo. Especially in terms of preventing boat accidents caused by ocean currents.
Determination of Indonesia’s Marine Deflection of Vertical from Multi-Mission Altimetry Satellite Data
Authors: Fauzan Ahmad , Wijaya Dudy Darmawan , Nurzaman Fathin , Khadami Faruq , Park Hansan 
Published: October 2023

Abstract
The deflection of vertical (DOV) is important for studying the changes in the Earth’s mass, improving the accuracy of geoid models, and the accuracy of the Earth’s gravity field. Compared to traditional methods such as astrogeodesy and astrogravimetry measurements, altimetry satellites have the advantage of observing DOV due to uniform global distribution, denser measurement points, consistent precision, less time required, high temporal resolution, and can be used in all weather conditions. In this study, multi-mission altimetry satellites including TOPEX/Poseidon, Jason-1, Jason-2, Jason-3, ENVISAT, Geosat Follow On (GFO), Sentinel-3A, Sentinel-3B, Sentinel-6A, Cryosat-2, and SARAL were used to determine DOV in Indonesia’s marine with a spatial resolution of 1’ x 1’. The Hwang et al. (1998) method is used to calculate DOV from satellite altimetry data by least-squares adjustment with weights using the second-order inverse distance weighting (IDW) method for each grid. The results show that the variance of the north-south and west-east components resulting from the gridding results are 0.05 arcseconds and 1.2 arcseconds. The evaluation results with the global model from EGM2008 show that the standard deviation values for the north-south and west-east components are 0.63 arcseconds and 1.96 arcseconds, respectively. From the evaluation, it can be concluded that the gridded DOV model is close to EGM2008, but there are still challenges for improvement, especially for the west-east DOV component.
Coastline Change Analysis using Landsat-8 on Rebana Metropolitan Area, West Java
Authors: Welly Tri Kies , Windupranata Wiwin 
Published: October 2023

Abstract
The Rebana metropolitan area is an industrial area development covering Cirebon-Patimban-Kertajati to support accelerated economic growth, especially in the West Java region. In order to minimize failures in supporting the development targets of the Rebana metropolitan area, it is necessary to carry out spatial planning with consideration of the hazard aspects in the development area. One of the aspects that need to be studied further is the dynamics of the coastal area such as coastline changes that occur due to erosion or sedimentation. Analysis of erosion and sedimentation is essential for further studies to be carried out regarding the factors that cause erosion and sedimentation and how to protect and prevent them in the future. This research utilizes remote sensing techniques and integrated geographic information systems (GIS) to identify coastline changes from 2017-2022 in the coastal areas of Subang, Indramayu, and Cirebon districts which are included in the Rebana metropolitan area. In this study, Landsat-8 satellite imagery is used to identify and quantify Spatio-temporal changes that occur in the coastal area of the Rebana metropolitan area in 6 years. The Normalized Difference Wetness Index (NDWI) algorithm is used to separate wet and dry objects which are interpreted as bodies of water and land. Thresholding the results of the NDWI algorithm along with the on-screen digitization approach was carried out for coastline extraction. The calculation of coastline changes is carried out using the Digital Shoreline Analysis System (DSAS) so that the rate of change of coastline in the study area is obtained. During the study period, the results showed that the average erosion rate in the Rebana metropolitan area was -3.66 m/year and the average sedimentation rate was +6.28 m/year, where the greatest erosion rate occurred in Kapetakan sub-district, Cirebon Regency with an average rate -7.63 m/year, and the greatest sedimentation rate occurs in Pusakanagara sub-district, Subang Regency with an average rate +24.64 m/year. Karangampel Sub-district in Indramayu Regency has 79.89%, the widest erosion area of its total coastline length, and Balongan Subdistrict, Indramayu Regency has the widest sedimentation, 91.37% of the total coastline length. The land use that is most affected by erosion and accretion in the coastal area of the Rebana metropolitan area is fishpond.
Estimation of Shoreline Changes of Can Thanh Townlet and Long Hoa Commune in Hochiminh City
Authors: Ha T C , Nguyen T P C 
Published: October 2023

Abstract
Can Gio is considered as the “green lung” of Ho Chi Minh City with the mangrove ecosystem with many investment projects as well as livelihood models associated with the strength of mangrove forest. Currently, in Long Hoa commune and Can Thanh town, the “Can Gio sea encroachment project” is being implemented with the goal of creating an urban area of sea encroachment tourism, resort and business tourism with events, conferences and seminars. In the process of construction, infrastructure expansion, service development and dense population concentration, it is inevitable that the shoreline change processes will be affected, especially within these two coastal areas. This study presents a method of using the integrated DSAS tool in ArcGIS together with Sentinel 2A image data to assess the shoreline change of Long Hoa commune and Can Thanh town from 2015 to 2022. By extraction shoreline through the MNDWI index, the results show that the process of accretion and erosion were intertwined, except for the sections of the shore that have been reinforced with sea dykes. It is evident that in the land at Dong Tranh Cape, southwest of Long Hoa commune and northeast of Can Thanh townlet, the process of erosion is taking place, while in the southwest, the process of accretion is predominant. The results of this study can be considered as a reference for coastal development in Can Gio sea area in the present and in the future.
Single-use Plastics: Legal Perceptions and Self-Reported Behavior in Vietnam
Authors: Ngoc P T B , Phuong V B , Nghia L H 
Published: October 2023

Abstract
Plastic pollution has become a serious global threat to ecosystems, human health, and economies, particularly in countries with coastlines such as Vietnam. The 3R approach (reduce, reuse, recycle) has been recognized as an important strategy to minimize plastic waste and reduce the risk of plastic entering the ocean. However, changing single-use plastic consumption habits is a great challenge that requires awareness, education and action. This study uses mixed methods, including a survey and semi-structured interviews, to explore: 1) Single-use plastic consumption and 3R behaviors of Vietnamese people; 2) How they perceive the current environmental regulation enforcement; and 3) How they perceive the role of stakeholders in the plastic problem. A self-nominated sample of 202 participants residing in Hoi An City, Ha Noi Capital and Ho Chi Minh City responded to the survey, and in-depth interviews were conducted with ten key informants (including workers from the public and private institutions, citizens and researchers). The results suggest that the convenience, affordability, availability and durability of plastics are the drivers of consumption, while legal bans, health and environmental concerns are motivators of reduction. For 3R behaviors, the participants reported the highest level of recycling, followed by reducing and reusing, acknowledging the help of Vietnamese traditional habits such as selling “ve chai” (recyclables) and using “cặp lồng” (inox food containers) for their 3R behaviors. Finally, the participants observed that penalties for plastic littering are low and too leniently enforced, especially for businesses. They also believed that stakeholders, including businesses, governments, and consumers are the main actors in tackling the single-use plastic waste problem. This study provides some recommendations based on these findings.