bluuebunny/crossref_metadata_2025_split huggingface dataset:
Run-out distribution of debris-flow materials: case study from some Java landslides
Authors: Sadisun Imam A. , Kartiko Rendy D. , Dinata Indra A. 
Published: August 2019

Abstract
Indonesia is a risk prone country from landslide disasters. The occurrence of landslides followed by the debris flow often make a lot of casualties and very terrible destructions. Accordingly, debris flow modeling of some Java landslides has been conducted in this study to determine run-out distribution characteristics of the debris materials. The concept of debris flow modeling is based on the equations of momentum, continuation, riverbed deformation, erosion/deposition and riverbed shearing stress. From this modeling, it has been indicated the best fit simulation results. In this case, run-out distributions of Pacet landslide at Mojokerto, December 12, 2002 has been properly modeled with a scenario of 0.4 viscosity value for around 5 minutes. At Sijeruk landslide, Banjarnegara, January 4, 2006 run-out distributions have been modeled using viscosity value of 0.45 for 14 minutes 51 seconds. Meanwhile, the modeling for Tenjolaya landslide at southern Bandung, February 23, 2010 with viscosity value of 0.38 shows time needed for debris materials to reach depositional area is estimated for around 12 minutes 37 seconds. From this study, debris flow modeling had given better understandings regarding flow track, velocity and distribution of debris materials from some debris flows in Java.
The Spread Of Dry Area Based On TVDI Index (Temperature Vegetation Dryness Index)
Authors: Aisyah A , Kusratmoko E , Wibowo A 
Published: August 2019

Abstract
This research explains the use of Remote Sensing to know which areas are dry that are connected by the morphological characteristics in the Sukaresmi district. The purpose of this research is to see the spread of the dry areas in Sukaresmi district which are vulnerable towards drought when the dry season comes using the Remote Sensing application. The Landsat image 8 OLI was used throughout July-September 2013 and between June-August 2017. One of the methods that used in Remote Sensing is triangulation. This method is known as TVDI (Temperature Vegetation Dryness Index) which consists of NDVI (Normalized Difference Vegetation Index), LST (Land Surface Temperature) with the algorithm formula of (LST–LSTmin)/(a+b*NDVI–LSTmin) that used in determining the dry areas in Sukaresmi district. The relation between the spatial pattern of the dry areas and the morphological characteristics of an area analyzed statistically. This research concludes that the spatial pattern of the dry areas in Sukaresmi district based on the TVDI method reached the highest rate of drought in September 2013 with 163.26 ha, and the drought in June 2017 with a whopping 336.43 ha. The drought areas usually concentrated on the morphological characteristics of the soil of the inhabitants, rice fields, and inclination of the slopes.
Constructing total suspended solid modelling on Agathis Lake by employing resource modelling associates program
Authors: Prastica R M S , Soeryantono H , Marthanty D R 
Published: August 2019

Abstract
This research uses Resource Modelling Associate (RMA) program to conduct a two-dimension model of Agathis Lake to analyse velocity and sediment transport distribution. The main programs are RMA-10 for velocity distribution and RMA-11 for the pollutant distribution. The sediment transport focuses on total suspended solids (TSS) pollutant. The research aims to construct total suspended solid model. Firstly, RMA Generation produces mesh of Agathis Lake. Next, RMA-10 and RMA-11 would perform both velocity and TSS simulation model to represent the actual condition. This research still gives temporary result due to limited sampling data. Calibration analysis of the model is needed to make the result of the program more accurate and more representative to the real condition.
Abrasion and accresion at West of Buleleng subdistrict’s coastal area, Bali (case study: Gerokgak Regency, Seririt Regency, Banjar Regency, and Buleleng Regency)
Authors: Putera Indrawan I Nyoman , Damayanti Astrid , Rustanto Andry 
Published: August 2019

Abstract
Gerokgak, Seririt, Banjar, and Buleleng coastal areas are located in the west of Buleleng Regency, Bali. These area are prone to abrasion and accretion. Abrasion and accresion is a natural phenomenon that’s runs balanced. Human factor caused this phenomenon were change the balanced, it causes harm to humans. The purpose of the research were to analyze influece of abrasion and accresion toward land use wide at coastal area. The research used Landsat 5, 7, and 8 images with 3 periods which were 1990 and 1997, 1997 and 2007, and the last period was 2007 and 2017. The data were processed by calculate long, width, and wide of coastline change inter period. It were relate with wide’s land use change at coastal area. The result showed that abrasion and accresion were happen along the coastal areas in research area. The worst abrasion were located in Gerokgak Subdistrict with extensive 217.109 m2 One of it’s impact are some ponds and buildings around the Segara temple at Gerokgak Village’s were destroyed.
Modification of natural waterway shape as a river trash interceptor–an approach model for Citarum River recovery
Authors: Suryaningsih Sri , Hidayat Sahrul , Sunardi  
Published: August 2019

Abstract
The Citarum River is the most polluted river in Indonesia. The river irrigates three cascade reservoir such as Saguling, Cirata and Jatiluhur, which serve for hydroelectric power plant, drinking water, agricultural irrigation and fishery. Solid municipal waste and agricultural debris that is dumped into the river cause destruction of river habitats, flooding and shallowing especially in cascade reservoirs. This study aims to develop an idea of river recovery from waste, by using namely river trash interceptor (RTI) located at the Citarum river tributaries due to the economic consideration and efficiency. By using CFD (Computational Fluid Dynamics) and Particle Tracing module, the form of the interceptor is simulated based on the mostly general form of the Citarum River waterway; straight line shape, bend shape and U-type shape. The parameters used are river depth, river width, water discharge, particle size and density. These results of this study could be used as a reference for decision makers and developers on further development of the RTI in the near future.
Thermal model of lava in Mt. Agung during December 2017 episodes derived from Integrated SENTINEL 2A and ASTER remote sensing datasets
Authors: Aufaristama M , Hoskuldsson A , Jonsdottir I , Ulfarsson M O , Erlangga I G D , Thordarson T 
Published: August 2019

Abstract
In the beginning of December 2017, Mt. Agung eruption powered down to minor ash emissions and on the middle of December, aerial photographs of the crater were taken by Indonesia Centre of Volcanology and Geological Hazard Mitigation (PVMBG) showing a steadily growing lava occupying approximately one third of the crater. 3D digital elevation model (DEM) of crater were created by PVMBG during and before the eruption, corresponded to lava volume around 2 x 10−2 km3 has been filled the crater. Here we present a method for deriving thermal model within the lava during eruption on 8 and 9 December 2017 using observations from multi infrared satellite SENTINEL 2A and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER). We use Thermal Eruption Index (TEI) based on the Shortwave infrared (SWIR) on SENTINEL 2A and Thermal Infrared (TIR) on ASTER, allowing us to differentiate thermal domain within the lava. This study has successfully produced model of sub-pixel temperature (Th), radiant flux (Φrad) and crust thickness model of lava (Δh). The subpixel temperature and radiant flux during the eruption is in the range 655 to 975 °C and 179 MW respectively. The crust thickness model of the lava in the range of 9 to 14 m and the total volume of lava crust during this period is estimated at 3 x 10−3 km3. The combination of infrared satellite remote sensing data shows a potential for fast and efficient classification of difference thermal domains and derive thermal model of lava.
GIS Application and Remote Sensing for Monitoring the Changing of Coral Reefs in Belitung Regency
Authors: Sari P R , Saraswati R , Wibowo A 
Published: August 2019

Abstract
Coral reefs are one of the most important and the most vulnerable marine ecosystem in the world. The coral reefs can be damaged, because of environmental factors and human activities, such as overfishing and polluted activities. Bangka Belitung islands are one of the provinces in Indonesia that have a huge potential of coral reefs, which are likely being damaged. This study aims to analyze the changing of coral reefs that occurred in the islands of tourist destinations in Belitung Regency from 2005 to 2018. This study used Landsat satellite imageries such as Landsat 5 TM for 2005, Landsat 7 ETM+ for 2011, and Landsat 8 OLI/TIRS for 2018. In this study, the changes of coral reefs will be determined by image data processing. Then, overlay methods are used to analyze the changes. In 2005, the coral reefs had an area of 4.68 km2, but in 2011, the coral reefs area changed to 2.45 km2. Then, in 2018, coral reefs have changed to 2.04 km2. In the year of 2005 and 2011, the area of coral reefs has decreased around 2.23 km2. While in 2011 and 2018, the area of coral reefs has decreased around 0.41 km2.
Remote sensing and GIS for land conservation: identification of post-tin mining land conservation in Perimping Sub Watershed
Authors: Erthalia Meike , Supriatna  , Damayanti Astrid 
Published: August 2019

Abstract
Perimping sub-watershed is part of a mayor watershed in Bangka Regency where the expansion of tin mining was very high since 2001. However, this watershed still categorized as Priority II which mean it has to be maintained and retained for any changes. Environmental management program such as land conservation of post-tin mining area was contributed to maintained the condition around watershed which damaged by mining activity. This study aimed to identify the distribution of post-tin land conservation in Perimping sub-watershed based on land surface temperature and NDVI data in term of 2001, 2009, and 2017. Landsat 5 TM and Landsat 8 OLI/TIRS were used to estimate LST and NDVI. Google Earth imagery also used to identify the landcover change of land conservation. The result showed the average of LST around post-tin mining area were decreasing from high in 2001 (31°C-35°C) to moderate in 2017 (26°C-30°C). Yet the NDVI showed enhancement trend from low (0.1-0.25) to high (0.51-0.70). Both LST and NDVI distributed in the centre of Sub Perimping Watershed Area which indicate that the density of vegetation cover around post-tin area is increasing as the result of post-tin land reclamation and revegetation program.
Spatial Dynamics Model of Land Availability and Mount Merapi Disaster-Prone Areas in Sleman Regency, Yogyakarta Special Region Province
Authors: Novia Utami Nabila Dety , Supriatna  , Anggrahita Hayuning 
Published: August 2019

Abstract
The existence of Mount Merapi in Sleman Regency makes the agricultural land in the area fertile and that becomes the attraction for humans to occupy the region. A high population growth will lead to the residents demand of the availability built-up land higher, that makes the environmental carrying cappacity in Sleman Regency decrease. However, the volcanic activity of Mount Merapi becomes a threat to the people who live in the area of Disaster Prone Areas of Mount Merapi. Predictions on the availability of land as well as the relation to the disaster-prone areas, and the carrying capacity of the environment needs to be done. 2007 – 2017 population data and Landsat 7 ETM + 2007, 2012, and Landsat 8 OLI 2017 imagery will be used in this research as variable in the spatial dynamics model. Meanwhile, physical and accesibility data such as slope, distance from the river, distance from protected area, distance from road, and distance from the center of economic growth will be used as limiting factor of built-up land. Environmental carrying capacity can be observed through a dynamic system model of the relationship between population growth and land availability within the period of 2007 - 2100, then made into the spatial dynamics model to know it’s spatial stance. The results of this model show that built-up land increasing every year, packed areas that are suitable for built-up land first, then encroach on areas which not suitable for built-up land and Mount-Merapi Disaster-Prone Areas.
Controlling factors of underground river system of karst region in Pacitan Regency, East Java
Authors: Bahri A S , Hardyani P V , Utama W , Hilyah A , Purwanto M S , Fajar M H M 
Published: August 2019

Abstract
One of the interesting karst areas is the Pegunungan Sewu, because of the existence of an underground river system that developed below it. The underground river system of Bribin in Gunung Kidul, Yogyakarta is one of the evidence found by previous researchers. In Pacitan District there are karst landscapes that have not been widely studied. Pacitan karst area is in the eastern part of the karst area of Pegunungan Sewu. As the characteristics of the karst region in general, in the Pacitan karst region, there are small hills, vertical hole, closed depressions, rough and pointed surface outcrops, stalactites and stalagmites, and the presence of muddy and water sources. The Pacitan karst area is similar to the Gunung Kidul karst area which has an underground river system. However, the development of underground river systems from these two regions is thought to be different. The purpose of this study is to analyze typical and the controlling factors that influence the development of underground river systems in the Pacitan karst area, East Java. This research was conducted using VES (Vertical Electrical Sounding). The results showed that the typical underground river system that develops in the area of research is more shallow than in Gunung Kidul and suspected to be in the Vadose and it is controlled by the movement of water from the incoming surface through rock fractures.
Contact angle measurement of fluid with salinity variation on sandstone rock surface
Authors: Winardhi C W , Fauzi U 
Published: August 2019

Abstract
Interaction between fluids and solid surfaces plays important roles in many fields, e.g.: enhanced oil recovery (EOR), environmental engineering, agriculture, materials, etc. Research on this topic is intensively carried out by many researchers. In this research, a simple experimental setup for fluid contact angle measurement is constructed using an optical microscope and video camera with 29 frames per second. Measurement of contact angle of fluid with variation of salinity, i.e.: 1M, 2M, 3M, 4M, and 5M is carried out by recording a single droplet placed on a rock surface. Each frame of the recorded video are then analysed using image processing technique to detect the edge and calculate the contact angle. A single 8th order polynomial was applied to the edge of the wetting type droplet, but two types of polynomial fitting curves are applied for edge of non-wetting type droplet. It is obtained that on preparatory glass, the higher the molarity, the longer the droplet will evaporated. On the sandstone surface, fluid contact angle on sandstone surface is about 80° and decreases with time with different trend of decrement. This may be due to complex interaction between fluid and pores at sandstone surface spot.
Clay minerals in the sediments as useful paleoclimate proxy: Lake Sentarum case study, West Kalimantan, Indonesia
Authors: Dianto A , Subehi L , Ridwansyah I , Hantoro W S 
Published: August 2019

Abstract
Lake Sentarum is a flood-plains lake that will dry and flood as climate cycle that is interesting to be studied climate change from the past to near the present. The objective of this study is to reveals paleoclimate conditions by analysing clay minerals that present in the lake sediments. The study investigated clay mineral in lake sediments from 70 cm long core, X-RD analysis was obtained to identify various of clay minerals. The clay minerals of Lake Sentarum comprises of illite, chlorite, and kaolinite. The relative change in abundance of clay minerals indicating climate conditions, besides numbers of chemistry and crystallinity of illite represents weathering mechanism. Our research reveals that climate history of Lake Sentarum from sediments core began cold and arid climate episode. This episode was characterized by low value of illite chemistry and illite crystallinity were 0.37-0.41 and 0.19°Δ2θ-0.2°Δ2θ, respectively, and slight decrease abundance of kaolinite. There was no significant changes until the middle of the sediments core. Significant changes of abundance of kaolinite and illite chemistry occurred in top of the core. The percentage of kaolinite and illite chemistry became the highest value that reflected strong chemical weathering occurred in the watershed with warm and high rainfall climate conditions.
Geometric tortuosity analysis of porous medium using simple neurite tracer
Authors: Amien Muhammad Nashih , Pantouw Genki Tanod , Juliust Hessel , Eljabbar Latief Fourier Dzar 
Published: August 2019

Abstract
The concept of tortuosity is used to measure and characterize the structure of porous media. Geometric tortuosity is the ratio between the shortest pathway in the medium to the distance between the inlet and outlet plane. Simple Neurite Tracer method is used to track the connected pores by tracing the tube structures of pores in 3D image stacks. In this analysis, the method is directly applied to the pore structure itself as well as the skeleton of the pores which represent the essential structure of the pore. The method is applied to four simple models of pores with different complexity levels, both the actual pore structure and the skeleton, to determine the effect of complexity to the tortuosity. The analysis is the applied on a digital sample of porous rock model with the size of 256 × 256 pixels. The interconnected pore for both the actual pore structure and the skeleton representation is traced by the Simple Neurite Tracer method. It was observed that the skeleton is a good representation of the actual pore because the pattern of tortuosity obtained between this two approaches are very similar. For all synthetic samples, the more complex the pore structure, the greater the tortuosity.
Implementation of overlap degree in sphere packed sedimentary rock model and its impact to pore structure characteristics
Authors: Latief Fourier D E , Pantouw Genki T , Wongkaren Hessel J , Amien Nashih 
Published: August 2019

Abstract
Computerized rock modelling is studied and developed because natural rock samples can sometimes be difficult and expensive to obtain. Sedimentary rock modelling is a process of generating a digital sedimentary rock model using numerical methods which resembles the ideas and processes of natural sedimentary rock formation. One of the most important physical characteristics in generating the model is how the pore structure is affected by overlap degree among each grain. The overlap degree simulates the output of compaction process in natural sedimentary rock formation. The approach to implement such idea is by using spherical grains so that the degree of overlap could exactly be determined quantitatively. Stochastic method is used in the algorithm to map each grain positions based on a desired range of overlap degree. From previous trials it shows that higher overlap degree produces lower porosity. The algorithm is implemented in generating two dimensional cross sections of the model as well as in generating three-dimensional structure. Characteristics of pore structure are analyzed for various modelling parameters to obtain better understanding of the modelling nature.
Determination of chemical elements that controlling magnetic susceptibility of cacao farming soil in Koting A Sikka Nusa Tenggara Timur
Authors: Zulaikah S , Rosalina E R , Suaidi dan D A , Agustine E 
Published: August 2019

Abstract
Koting A in Sikka is one of the most popular and productive agricultural cacao areas in Nusa Tenggara Timur. The area was selected in this study with the aim of understanding the soil magnetic properties that is suitable for cocoa farming. This study assessed the magnetic susceptibility and chemical element content of cocoa farms soils. Magnetic susceptibility was measured by Bartington MS2B on 72 samples taken from 8000 m2 farming area, whereas the determination of chemical elements was done by XRF test on 3 representative samples. The results showed that the magnetic susceptibility of low frequency χlf has a range between (12-20) × 10−6m3kg−1 and the soils contains some dominant elements of Fe about 37%, Al 7 – 8%, Ca 11 -12%, Si 29-32%, Ti of about 2% and nickel 3 - 4%.
The stage of tourism object development in Bantul Regency, Special Region of Yogyakarta, Indonesia
Authors: Darajat Akhmad Shidiq , Susilowati M H Dewi 
Published: August 2019

Abstract
Bantul Regency has many tourism objects potentials such as nature tourism and cultural tourism. The objective of research was the correlation between the stage of tourism object development and type of attractions, landform. The method used are the spatial and statistical analysis (chi-square). Research variables include the number of visitors, primary facilities, secondary facilities, conditional facilities, accessibility, commercialization, and promotion. The results showed the stage of tourism object development in Bantul Regency included on involvement stage, development stage, and consolidation stage. Result of statistical analysis showed; (1) the correlation between the stage of tourism object development and type of attraction was not significant at the significance level (α) = 0.05; (2) the correlation between landform and the stage of tourism object development was not significant at the significance level (α) = 0.05, which means that the stage of tourism object development in Bantul Regency are not always on the right type of attraction and landform.
Assessing of economic losses in landslide affected areas in Cibanteng Village, Cianjur District, West Java
Authors: Abidin F G , Kusratmoko E , Susiloningtyas D 
Published: August 2019

Abstract
Indonesia is one country that has a high incidence of natural disasters. Among the various types of disasters, landslides are one of the most common hydrometeorological disasters. One of the areas that have a high rate of landslide disaster is Cianjur district, West Java province. Assessing of economic loss due to landslide disaster in a region is one of the important tools in the recovery and reconstruction framework. The purpose of this research was to asses the indirect losses of three areas affected by landslide in Cibanteng Village, Cianjur district, West Java. In this study, the UAV (unmanned aerial vehicles) was used to create high-resolution maps of areas affected by landslide. Participatory mapping was conducted to delineate damaged land use areas and then interviewed the farmers to obtain information about the agriculture activities. The results of this study showed that the amount of indirect losses in the three location reached Rp 352,811,700 (US $ 25,200) at the landslide occurance and Rp 1,205,152,300 (US $86,082) for the indirect losses in 2.5 years. This value can be a reference for assessing indirect losses in other areas.