Regional Government Service Innovation Model in Disaster Mitigation

Indonesia has a geographical, geological, hydrological, and demographic situation prone to disasters with a relatively high frequency, thus requiring systematic, integrated, and coordinated disaster management. The disasters that occurred until 2020 were dominated by hydro-meteorological natural disasters such as floods, landslides, hurricanes, droughts to forests, and land fires (BNPB, 2021). The purpose of this study is to identify innovation models for regional government services in disaster mitigation. This study uses a qualitative descriptive method with data collection techniques, namely literature studies, FGDs, and interviews with related disaster mitigation innovations at the research location. The field findings illustrate that the SDIS innovation implemented by Sleman Regency is among the best innovations in handling volcanic eruptions. This innovation has been initiated since 2016 and continues to be refined. In the city of Semarang, specifically for flood disasters, the Early Warning System tool was installed at several points as the best innovation in flood management. However, difficulties were installing it at certain points due to geographical contours that were impossible. Meanwhile, for Sumedang Regency, their innovation through the SITABAH application still needs further development to become the best innovation in landslide mitigation due to limitations in infrastructure and human resources. In addition, the application is still one-way. Of the three disaster mitigation innovation models, the SDIS innovation is an innovation that has been successfully implemented by the Regional Disaster Management Agency of Sleman Regency. Especially on the "My distance and Merapi" feature, which can be accessed online, this innovation model can be replicated in other areas.

Slope and Landslide Stabilization: A Review

Slope stabilization is the one of important fundamental aspect for preventing landslides. For a safer design of the structure, slope stabilization is very important. There are various studies conducted on slope stabilization and landslide mitigation. Geotechnical Engineers and Structural Engineers play an important role in analyzing and designing slope stabilization and landslide mitigation and prevention. This study is also helpful for the design of slopes. The study also helps for quick assessment of slopes. This paper also explained stabilization methods and techniques for slope. This study is also helpful in improving the shear strength of the slope of soil. This paper helps to understand basic knowledge on slope stabilization and landslides for every Engineer easily.

Slope and Landslide Stabilization: A Review

Slope stabilization is the one of important fundamental aspect for preventing landslides. For a safer design of the structure, slope stabilization is very important. There are various studies conducted on slope stabilization and landslide mitigation. Geotechnical Engineers and Structural Engineers play an important role in analyzing and designing slope stabilization and landslide mitigation and prevention. This study is also helpful for the design of slopes. The study also helps for quick assessment of slopes. This paper also explained stabilization methods and techniques for slope. This study is also helpful in improving the shear strength of the slope of soil. This paper helps to understand basic knowledge on slope stabilization and landslides for every Engineer easily.

Disaster mitigation on lands affected by landslides in Banjarnegara Regency

Landslide mitigation on potentially-affected lands is one of the crucial efforts in Banjarnegara Regency. Such effort, however, must comply with the existing environmental and land use conditions. This research aimed to determine the landslide susceptibility level and landslide mitigation on the affected land. A descriptive quantitative method was used to determine landslide susceptibility, and a survey method was used to determine its condition. Landslide susceptibility was examined using an overlay analysis of the major factors: slope, texture fault, regolith, and geology. The analysis results show that the levels of landslide susceptibility of the research location consisted of: not prone (19.21%), slightly prone (4.95%), moderate (6.92%), prone (29.20%), and very prone (39.72%). It also predicted that 335,940 people (36.80%) lived in highly and very-highly vulnerable areas. Based on the results, mitigation is targeted on three groups of land, including water bodies (269.57 ha), vegetated area (69,946.98 ha), and non-vegetated area (3,506.25 ha). Both physical and social mitigation actions are thus required. Physical mitigation includes slope protection (terracing, vetiver system, slope-protection structures, ground fractures covering), water management (manual horizontal drainage, drainage channel), vegetation management (multi-stratum canopy, root morphology, and plant biomass), whereas social mitigation involves community management by promoting public awareness and vigilance against disasters, and the active role of both community and stakeholders.

Identification of Landslide with Resistivity Method at Candi Industrial Area, Ngaliyan, Semarang

Landslides can be occurred in almost every natural slope or artificial slope slowly or suddenly with or without any prior signs. The main reason for slope collapse is the increase in shear stress in the landslide, the decrease in shear strength, or both. Landslide problems can result in loss of life and property, damage to the environment, infrastructure, public facilities, and disrupt livelihood generally. Landslides can be detected by exploration of the subsurface. The geoelectrical method is one of the geophysical methods to know the change of resistance of a type of rock layer below ground level. The research aims to interpret the lithology of the subsurface in the Candi Industrial Area, Ngaliyan, Semarang using Schlumberger configuration. The results of measurements are voltage and electric current to calculate the apparent resistivity value processed by IP2Win software to determine the lithology and the slip surface area. The results present that lithology in the research area consists of sand clay, clay, and sandstone. The results showed that the locations of landslide-prone areas lie at the contact between sand clay and clay with that area at a depth of between 19.95 – 31.62 m there is one difference in the resistivity value which can be assumed to be a slip surface.The result of the research can be used to make policy rules of landslide mitigation.

Recharge response and kinematics of an unusual earthflow in Liechtenstein

Understanding landslide behavior over medium and long timescales is crucial for predicting landslide hazard and constructing accurate landscape evolution models. The behavior of landslides in soil that undergo periodic displacements, termed earthflows or compound soil slides, is especially difficult to forecast at these timescales. This is because velocities can increase by orders of magnitude over annual to decadal timescales, due to processes such as changing recharge conditions, erosion of the landslide toe, and retrogression of the landslide head. In this paper, we provide a detailed analysis of the Schlucher landslide, an unusual earthflow that is perched above the village of Malbun, Liechtenstein. This landslide had been displacing by 10 to 20 cm/year until 2015, when displacements on the order of 2 m/year occurred from 2016 to 2018. These large displacements damaged landslide mitigation measures, caused numerous surface deformation features, and threatened the local population downstream of the earthflow. This landslide has an unusually long monitoring record, with accurate displacement and climatic data available since 1983. We analyze this nearly 40-year monitoring time series to estimate recharge from snowmelt and rainfall, and its correlation with displacement. We also analyze recently collected, high-resolution surface and subsurface data in order to understand landslide response to recharge, landslide kinematics through time, and catastrophic failure potential. We find that interannual displacements can be explained with variations in recharge; however, periodic surges with recurrence times of tens of years must be explained by other mechanisms. In particular, recharge into the landslide during the recent acceleration (2016 to 2018) was not anomalously high. Instead, we argue that loss of internal strength is responsible for this recent acceleration period, and that this mechanism should be considered when forecasting the surge potential for certain earthflows and soil slides.