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<![CDATA[Simulation of High Wave Inundation at Payangan Beach Using Delft3D for Coastal Mitigation ]]>
<![CDATA[Louis Elsa Gloria]]>;
<![CDATA[Retno Utami Agung Wiyono]]>;
<![CDATA[Gusfan Halik]]>
<![CDATA[ UKaRsT Vol. 7 No. 1 (2023): APRIL ]]>
Publisher : <![CDATA[Kadiri University ]]>
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DOI: 10.30737/ukarst.v7i1.3233
<![CDATA[The south coast of Indonesia has a high risk of high waves. The community around Payangan Beach was one of those affected by the high waves, which caused damage to various buildings and inundation. One of the disaster mitigations to reduce the impact that occurs is to do inundation modeling. This study aims to model inundation due to high waves on Payangan Beach using Delft3D software. Wind, bathymetry, and tide data are used as model input data. The model was created using Delft3D-FLOW for tides while Delft3D-WAVE for waves. After the program is executed, the height and area of the inundation and significant wave height will be obtained. The modeling results will be validated with existing condition data using the Root Mean Square Error (RMSE). The modeling results show that the inundation height is 1.96 meters, the significant wave height is 2.45 meters, and the inundated area is 300 meters from the coastline, with 100 houses potentially inundated with an area of 187.4 m2. The validation results show that the model is quite good, with an accuracy of 96.88%. From these results, the Government of Jember was able to make a mitigation map for the inundation area on Payangan Beach and build a Sea Wall. So that in the future, high-wave disasters can be minimized.]]>
<![CDATA[Prediction Of Project Schedule Performance Index for Trans South Java Road Project Lot 7 Blitar Regency Using Bayesian Network ]]>
<![CDATA[Kristya Hadi Wicaksono]]>;
<![CDATA[Jojok Widodo Soetjipto]]>;
<![CDATA[Gusfan Halik]]>
<![CDATA[ UKaRsT Vol. 7 No. 1 (2023): APRIL ]]>
Publisher : <![CDATA[Kadiri University ]]>
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DOI: 10.30737/ukarst.v7i1.3552
<![CDATA[The south coast of Indonesia has considerable potential and competitiveness in the field of tourism. This encourages the government to strive to improve tourism infrastructure through the construction of the South Coast Road. In its implementation, project reporting must be measured and controlled to assist project management in identifying problems and factors that affect project activities. This research aims to identify the most influential factors on Schedule Performance Index and develop a prediction model using the Bayesian Network. 5 main factors that affect project performance, such as Heavy Equipment, materials, Implementation and Work Relations, Labor, and Environment are used to are set 13 scenarios to detect the behavior of each factor appropriately. The factor is confirmed to the respondent to ensure that the factor occurs in the project. The study's results obtained Bayesian Network approach can be used to assess the condition of the JLS Lot 7 Blitar Schedule Performance Index (SPI) with an accuracy of around 80%. The dominant factor affecting SPI is the condition of the Heavy Equipment. The condition of the Heavy Equipment will affect the condition of SPI so closely that the contractor must maintain the performance of the heavy equipment so that the project performance is always in good condition. The identification results are expected to help in better decision-making and project risk management.]]>
<![CDATA[Flood Susceptibility Mapping in Gending District by Comparison Frequency Ratio and Weight of Evidence for Mitigation Strategy ]]>
<![CDATA[Bachtiar Ilham Maulana]]>;
<![CDATA[Entin Hidayah]]>;
<![CDATA[Gusfan Halik]]>
<![CDATA[ UKaRsT Vol. 7 No. 1 (2023): APRIL ]]>
Publisher : <![CDATA[Kadiri University ]]>
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DOI: 10.30737/ukarst.v7i2.3999
<![CDATA[Floods are natural disasters that occur all over the world. Gending District in Probolinggo Regency, East Java, is an area that often experiences floods and causes various losses. A flood susceptibility map needed to prepare appropriate mitigation actions. Choosing the right method will produce a more accurate flood susceptibility map. The research aims to make a flood susceptibility map in Gending District by comparing the Frequency Ratio (FR) and Weight of Evidence (WofE) methods and providing appropriate mitigation recommendations. Six data factors that cause flooding are used: slope, elevation, land use, normalized difference vegetation index (NDVI), curvature, and rainfall. The data obtained were processed using the FR and WofE methods, which were then validated using the Receiver Operating Characteristics (ROC) method. The validation value is calculated using the ROC chart's Area Under Curve (AUC). The higher the AUC value, the better. The study's results revealed that the correct method for making a flood susceptibility map in Gending District was FR with an AUC value of 92.8%, while the WofE method was 90.4%. The flood susceptibility map illustrates that 14% of the area is in very high and high flood-prone zones, 23% is in the moderate zone, and 63% is in the safe zone. The appropriate mitigation strategy based on the highest FR value is creating drainage networks, and green open spaces, normalizing rivers in residential areas, and implementing selective logging and reforestation programs. The results of this study are used to reduce the impact and risk of future flood disasters.]]>
<![CDATA[Base Course Stabilization Performance Using Fly Ash-Based Geopolymers and Their Effect on Water Quality Standards ]]>
<![CDATA[Rustam Widarto]]>;
<![CDATA[Latif Budi Suparma]]>;
<![CDATA[Suprapto Siswosukarto]]>
<![CDATA[ UKaRsT Vol. 7 No. 1 (2023): APRIL ]]>
Publisher : <![CDATA[Kadiri University ]]>
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DOI: 10.30737/ukarst.v7i2.4235
<![CDATA[The road is the main gateway to human life and links essential access points. Some structure pavement failures happened due to the base layer's instability. Fly ash has been used in several parts of pavement structures to increase stability. One significant concern with using fly ash in base course stabilization is its proportion and potential impact on water quality standards. This research aimed to evaluate base course stabilization performance using fly ash-based geopolymers, as well as assess their impact on water quality standards. Materials in this study consisted of aggregate, fly ash, water, and alkaline reagent solutions. The variation of mix considered with a variety of alkaline reagents, namely without alkaline reagents, 3 mol, 6 mol, 9 mol, and 12 mol of NaOH. The ratio between NaOH and Na2SiO3 is 1:2. The use of fly ash in the class A aggregate base course layer has not been able to meet specifications. However, by providing 9 mol of alkaline reagent, the strength of the mixture increases so that the CBR value meets the specifications due to geopolymer bonding. When the alkaline reagent solution becomes more concentrated, the optimum water content decreases, and the bond between aggregates strengthens. The effect of alkaline reagents on water quality standards increases the acidity (pH) value, while other parameters such as BOD, COD, and TSS still meet the standards. This research point to another practical approach that is effective in the field to increase the stability of the base course layer and is environmentally friendly.]]>
<![CDATA[Increasing Water Capacity Services for South Binjai Community Demand with Intake Pump ]]>
<![CDATA[Mahliza Nasution]]>
<![CDATA[ UKaRsT Vol. 7 No. 1 (2023): APRIL ]]>
Publisher : <![CDATA[Kadiri University ]]>
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DOI: 10.30737/ukarst.v7i1.4310
<![CDATA[Indonesia is a country prone to water shortages. Water shortages can affect human well-being and cause disease. This happened in South Binjai Subdistrict, Binjai City, North Sumatra, Indonesia where clean water services were inadequate. Efforts to improve services need to be carried out. This study aimed to evaluate clean water service providers in South Binjai Regency. Evaluation is done by calculating the need for clean water with projected population and customer data. The feasibility analysis of service providers is calculated from the number of people served. So if it does not meet the national standard of 80%, then efforts must be made. The results of the evaluation of service providers in South Binjai District reveal that the coverage of clean water services in 2030 will only reach 17.946%, so service coverage still does not meet national standards. Service providers have limited water capacity. Therefore, the scope of services can be fulfilled by adding operational tools for taking clean water sources such as water pumps. The proposed strategy is to take water from the Bingei River with eight intake pump capacity of 6.25 l/s. The total cost of procuring these pumps in 10 years is IDR 1,529,280,000. Adding the intake pump can increase the water capacity up to 125%. The results of this study can be used as an effort to meet clean water needs in the future.]]>
<![CDATA[Grid Satellite Rainfall Products Potential Application for Developing I-D and E-D Thresholds for Landslide Early Alert System over Bali Island ]]>
<![CDATA[Putu Aryastana]]>
<![CDATA[ UKaRsT Vol. 7 No. 1 (2023): APRIL ]]>
Publisher : <![CDATA[Kadiri University ]]>
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DOI: 10.30737/ukarst.v7i1.4318
<![CDATA[Bali has been one of the most popular tourist destinations in Indonesia. However, on the other hand, Bali has a high risk of natural disaster vulnerability. The number of landslides in Bali took the first position compared to other natural disasters. Currently, remote sensing platforms can present Grid Satellite Rainfall Products (GSRPs), which provide rainfall information that can identify rainfall conditions for landslide events. This study aims to analyze the potential GSRPs application of Precipitation Estimation from Remotely Sensed Information Using Artificial Neural Networks (PERSIANN), the Integrated Multi-satellite Retrievals for Global Precipitation Measurement (IMERG), and Global Satellite Mapping of Precipitation (GSMaP) in determining the mean rainfall intensities and duration (I-D); accumulated rainfall and duration (E-D) thresholds for landslide occurrences over Bali Island. The method used to develop I-D and E-D thresholds is the power-law equation and frequentist sampling method in various probability levels (5%, 10%, 20%, 30%, 40%, and 50%). The result shows that I-D and E-D thresholds established by GSRPs are generally lower than the threshold defined by rain gauge observations. Among the three GSRPs, IMERG is performing the best in establishing the I-D and E-D thresholds for landslide phenomena. The level of potential that IMERG can use in developing the I-D and E-D thresholds is 59.16% and 84.06%, respectively. The E-D threshold derived from the IMERG product can be used to establish the landslide early alert system over Bali Island because it has a high spatial-temporal resolution, word-wide coverage, and near-real-time observation.]]>
<![CDATA[Fulfillment of Clean Water Needs in Tamangil Nuhuten Village with Addition of New Spring ]]>
<![CDATA[Paschal Rumihin]]>;
<![CDATA[Soebagio Soebagio]]>
<![CDATA[ UKaRsT Vol. 7 No. 1 (2023): APRIL ]]>
Publisher : <![CDATA[Kadiri University ]]>
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DOI: 10.30737/ukarst.v7i2.4464
<![CDATA[Seventy-two million Indonesians have difficulty accessing clean water, especially in rural communities. This causes various diseases and has an impact on people's welfare. Currently, the community's need for clean water in Tamangil Nuhuten Village depends on the Wiak spring and often experiences shortages. This research aims to analyze the need and availability of clean water in Tamangil Nuhuten Village. The need for clean water is calculated using water consumption data and the projected population. As for water availability, the water source discharge data is collected from the government and measures the water discharge directly to validate the data. It is necessary to analyze the water balance to determine the ability to meet the demand for clean water. The results showed that the need for clean water for the next 10 years is 2.0 liters/second, while the water supply is 1.06 liters/second, so it is still insufficient. Fulfillment can be done by adding the Baluruk spring 1.8 km away. Baluruk Spring can discharge of 83.3 liters/second with constant conditions throughout the year and meets clean water quality. Intake of clean water can be done by building two reservoirs to reduce the sediment content with dimensions of 4m x 6m x 3m, which are placed 500m from the village. As well as used two 6-inch pipes for transmission pipes and one 4-inch pipe for distribution. Thus the water needs of the Tamangil Nuhuten Village community can be fulfilled until 2031.]]>
<![CDATA[Design of Irrigation Channel Network Connectivity and Tertiary Channels in Menten Village, Rambutan District South Sumatra to Optimize Agricultural Land ]]>
<![CDATA[Sakura Yulia Iryani]]>;
<![CDATA[Agus Lestari Yuono]]>;
<![CDATA[Regina BR Manalu]]>;
<![CDATA[Reini Silvia Ilmiaty]]>
<![CDATA[ UKaRsT Vol. 7 No. 1 (2023): APRIL ]]>
Publisher : <![CDATA[Kadiri University ]]>
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DOI: 10.30737/ukarst.v7i1.4481
<![CDATA[South Sumatra Province is a province that is flowed by many rivers, including the Musi River, the longest river on the island of Sumatra. The condition of inadequate irrigation infrastructure means that farmers in Menten Village can only plant one crop per year. This study aimed to determine the irrigation water needs of tertiary canals and design the dimensions of connectivity and tertiary channels. Repairing the irrigation network in the village is planned to increase the productivity of agricultural land to two plantings in one year with a cropping pattern of rice and crops. This research was conducted following the following stages Calculation of Irrigation Water Needs, Calculation of Surface Runoff Discharge, Calculation of Channels Design Discharge, Calculation and determination of the dimensions of Connectivity and Tertiary Irrigation Channels. The study results obtained a Need Field Requirement (NFR) value of 1.572 l/s/ha with a maximum irrigation water requirement of 2.418 l/s.ha. To increase menten agricultural yields, a planting pattern of 2 times is planned. The planned channel is an open trapezoidal channel that functions as a carrier channel and a discharge channel namely rice and crops. There are three connectivity irrigation channels. While there are 25 tertiary irrigation canals. The results of this research can be used reference to improve irrigation systems that are still not optimal.]]>
<![CDATA[The Construction of a Gravity Retaining Wall to Prevent Landslides on the Grogol Kediri Highway ]]>
<![CDATA[Norazlan Khalid]]>;
<![CDATA[Adnan Derahman]]>;
<![CDATA[Raudhah Razali]]>;
<![CDATA[Noor Azreena Kamaluddin]]>
<![CDATA[ UKaRsT Vol. 7 No. 1 (2023): APRIL ]]>
Publisher : <![CDATA[Kadiri University ]]>
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DOI: 10.30737/ukarst.v7i1.4554
<![CDATA[One proof of Kediri's progress is the construction of Doho Kediri International Airport which is expected to improve the economy and tourism in this city. The airport was built with the aim of improving connectivity and suppressing development disparities in southern East Java. The purpose of this study is to plan the construction of an earthquake-resistant which is gravity retaining wall on the Grogol Kediri Highway, Kediri Regency. . Planning is carried out at STA 3.8-4.0. , soil laboratory testing on samples obtained from the studied location. Identification of the soil type, sliding angle, and weight of the soil volume at the site are needed to determine the planning of earthquake-resistant retaining walls. From the soil properties obtained, it can be determined that the land is included in the GC (Clayey Gravel) category With a shear angle of 28° and a weight of 1.463 gr/cm3. These results were used to calculate the dimensions and the stability of the retaining wall using the Coulomb method. The retaining wall should have a peak body width of 1 meter, foundation width of 3.8 meters, foundation thickness of 1 meter, foundation depth of 1.04 meters, foot and heel width of 0.9 meters, height of 6 meters, and bottom body thickness of 2 meters. Based on stability calculations, the retaining wall is safe against overturning, shifting, and subsidence. Therefore, this retaining wall is a viable solution to prevent landslides and mitigate the negative impacts caused by them.]]>
<![CDATA[Discrete Element Method Approach to Simulate Cracks in Four-Point Flexural Test ]]>
<![CDATA[Faqih Ma arif]]>;
<![CDATA[Slamet Widodo]]>;
<![CDATA[Maris Setyo Nugroho]]>;
<![CDATA[Zhengguo Gao]]>
<![CDATA[ UKaRsT Vol. 7 No. 1 (2023): APRIL ]]>
Publisher : <![CDATA[Kadiri University ]]>
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DOI: 10.30737/ukarst.v7i1.4401
<![CDATA[Concrete is a material that is widely used in construction. Concrete research efforts are ongoing and through a series of experimental tests. On the other hand, experimental tests require a lot of money, take a long time, and create waste. Several studies have revealed that numerical testing can accurately test concrete to fractures. However, modeling for the four-point load flexure test pattern is still not widely discussed. This study aimed to model the four-point flexural test of concrete using the discrete element method (DEM) approach. Sieve gradation was performed to determine particle size, and flexure testing was performed to calibrate the DEM model. DEM flexure testing was made using Yet Another Dynamic Engine (YADE) software with ASTM D6272 reference and beam dimensions 105 x 105 x 535 mm. The cohesive contact model with spherical particles is used, and the algorithm developed modifies the faceted sphere of interaction. The study results revealed that DEM can simulate crack behavior in flexural testing of unreinforced concrete. The DEM results show only a 2.13% difference in the experimental results of the flexural strength test. Meanwhile, crack behavior can be observed directly in the DEM simulation. The results of this study can be used to predict the failure pattern of the flexural test structure and to design the right proportion of the mixture to match the desired flexural strength. So that material efficiency and concrete flexure testing time can be achieved.]]>
