7 research outputs found
LANDSLIDE RUNOUT DISTANCE PREDICTION BASED ON MECHANISM AND CAUSE OF SOIL OR ROCK MASS MOVEMENT
No full textLandslide often occurs in tropical hills area, such as Indonesia. Research on landslide hazard evaluation is necessary to decrease the impact in affected and surrounding areas. Empirical-statistical methods can be used to predict landslide run out distance in an effort to avoid the danger of landslide occurrences. This study aims to determine the correlation between landslide run out distance against high, slope, and volume based on mechanisms and causes of soil or rock mass movement. Data mainly from 106 landslides in Indonesia has been analyzed to search for possible correlations and empirical correlations, there are 34 rotational slides, 54 translational slides, 8 debris flows, and 10 rock falls. Analysis begins by studying the characteristics of the data (explanatory data analysis) and then analyzed by using empirical methods such as geomorphological assessment and geometrical approaches. Then the data is processed by simple linear regression and multiple linear regression method using the R software. The results obtained from the analysis of the general empirical equation form of the correlation between height (H) and run out distance (L) is 1.066H1.093, respectively. This results indicate the higher altitude slopes, the greater distance will happen. The results of the analysis correlation between height and run out distance for the type of mass movements for rotational is L=1.346+1.788 H, translational is L=-3.88+1.578H, debris flow is L=0.682H1.29, and rock fall is L=2.223H0.897. This result shows debris flows landslide run out distance is greater than rotational, translational and rock fall. The results of the analysis correlation between height and run out distance of the trigger due to the rain is L=1.267H1.027, and by an earthquake is L=0.574H1.38. This results show run out distance caused by an earthquake is larger than caused by rain. The correlation between the run out distance and volume (V) yields empirical equation which is V=0.772L2.108. This results indicate that greater run out distance is affected by the growing volume of mass movement. The results of the analysis correlation between height and slope (θ) to run out distance is L=1.448H1.062 tan θ-0,482. This results indicate that slope has a significant impact on the value of landslide run out distance
Predictions of Rock Temperature Evolution at the Lahendong Geothermal Field by Coupled Numerical Model with Discrete Fracture Model Scheme
No full textThe comprehensive exploitation of geothermal fields has an impact on the productivity of the reservoirs. To realize sustainable steam production, changes in the rock temperature need to be predicted and controlled. A coupled thermo-hydro-mechanical (THM) model employing COMSOL Multiphysics was proposed to study the characteristics of heat transfer, fluid flow, and solid deformation at the Lahendong geothermal field, in North Sulawesi, Indonesia. The numerical results were compared with analytical and measured data in order to validate the numerical simulation. Based on the results, the predicted temperatures of the production wells showed significant decrease with the production time. In addition, a reduction in the reservoir temperature leads to lower specific gross electrical power within the production well, which should significantly reduce the sustainability of the power plant
Redesain Instalasi Pengolahan Air Limbah (IPAL) dengan Penambahan Unit Biodigester Skala Komunal Kapasitas 5 m3
No full textIPAL as a wastewater treatment facility from MCK activities in Sindangsari Village has been managed by KSM Amanah since 2013 and is still operating today. This WWTP accepts domestic waste input of 14,656 m3/day from 50 house connections and communal toilets with a total of 200-230 users per day. The management unit in the WWTP uses the DEWATS system which is equipped with a settler, biodigester, and ABR as a multilevel sedimentation and filtration tank. Communal MCK consists of 5 bathrooms and 1 operational room which is still functioning today. The condition of ABR is already filled with mud and there is a lot of garbage in it, so this condition can reduce the effectiveness of the existing WWTPs. For this reason, the domestic liquid waste produced must go through several processing stages so that the content of domestic liquid waste that will be disposed of to the environment is safe or can even be reused and as much as possible provides additional benefits in the form of biogas. The purpose of this study is to evaluate the domestic WWTP used and compare it with the domestic wastewater quality standards listed in the Minister of Environment and Forestry Regulation No. 68 of 2016. In addition, to maintain the MCK facilities that have been built, it is necessary to provide SOP guidance for both users and managers. Keywords: WWTP; DEWATS; domestic waste Abstrak IPAL sebagai fasilitas pengolahan air limbah dari aktivitas MCK di Kelurahan Sindangsari dikelola oleh KSM Amanah sejak tahun 2013 dan masih beroperasi sampai saat ini. IPAL ini menerima masukan limbah domestik sebesar 14,656 m3/hari dari 50 sambungan rumah dan MCK Komunal dengan total pengguna sebanyak 200-230 orang per hari. Unit pengelolaan yang terdapat pada IPAL menggunakan sistem DEWATS yang dilengkapi bak settler (pengendap), biodigester, dan ABR sebagai bak pengendapan bertingkat dan penyaringan. MCK Komunal terdiri dari 5 kamar mandi dan 1 ruang operasional yang masih berfungsi sampai saat ini. Kondisi ABR sudah dipenuhi lumpur dan terdapat banyak sampah di dalamnya sehingga kondisi ini dapat mengurangi efektivitas IPAL yang sudah ada. Untuk itu, limbah cair domestik yang dihasilkan harus melalui beberapa tahapan pengolahan agar kandungan limbah cair domestik yang akan dibuang ke lingkungan aman atau bahkan dapat dimanfaatkan kembali serta sebisa mungkin memberikan manfaat tambahan berupa biogas. Tujuan dari penelitian ini sehingga untuk mengevaluasi IPAL domestik yang digunakan dan dibandingkan dengan baku mutu air limbah domestik yang tercantum pada Permen LHK No. 68 tahun 2016. Selain itu, untuk menjaga fasilitas MCK yang sudah dibangun, perlu diberikan pengarahan SOP baik bagi pengguna dan juga pengelola. Kata Kunci: IPAL, DEWATS, limbah domestik, biogas
PREDIKSI JARAK LUNCUR LONGSOR BERDASARKAN MEKANISME DAN PENYEBAB GERAKAN MASSA TANAH ATAU BATUAN
No full textLandslide often occurs in tropical hills area such as Indonesia. Research on
landslide hazard evaluation is necessary to decrease the impact in affected and
surrounding areas. Empirical-statistical methods can be used to predict landslide
runout distance in an effort to avoid the danger of landslide occurrences.
This study aims to determine the relationship between landslide runout distance
against high, slope, and volume based on mechanisms and causes of soil or rock
mass movement. Data mainly from 106 landslides in Indonesia has been analyzed
to search for possible correlations and empirical relationships, there are 34
rotational slides, 54 translational slides, 8 debris flows, and 10 rockfalls. Analysis
begins by studying the characteristics of the data (explanatory data analysis) and
then analyzed by using empirical methods such as geomorphological assessement
and geometrical approaches. Then the data is processed by simple linear regression
and multiple linear regression method using the R software.
The results obtained from the analysis of the general empirical equation form of the
relationship between height (H) and runout distance (L) is L=1,047 H1,09. This
results indicate the higher altitude slopes, the greater distance will happens. The
results of the analysis relationship between height and runout distance for the type
of mass movements for rotational is L=1,346+1,788 H, translational is
L = -3,88 + 1,578 H, debris flow is L = 0,682 H1,29, and rockfall is L = 2,223 H0,897.
This result shows debris flows landslide runout distance greater than rotational,
translational and rockfall. The results of the analysis relationship between height
and runout distance of the trigger due to the rain is L = 1,267 H1,027, and by an
earthquake is L = 0,574 H1,38. This results show the effect of runout distance caused
by an earthquake larger than the effect due to the rain. The relationship between the
runout distance and volume (V) obtained empirical equation is V=0,772 L2,108. This
results indicate the greater runout distance occurs is affected by the growing volume
of mass movement. The results of the analysis relationship between height and
slope (θ) to runout distance is L = 1,448 H1,062 tan θ-0,482. This results indicate slope
have a significant impact on the value of landslide runout distance
Evaluasi Neraca Air Daerah Irigasi Sei Belutu Kabupaten Serdang Bedagai: Evaluation of Water Balance of Sei Belutu Irrigation Area of Serdang Bedagai Regency
No full textAnalisis neraca air dapat memberikan pemahaman terhadap siklus hidrologi dalam penjadwalan irigasi yang tepat untuk memenuhi nutrisi tanaman padi serta efisiensi penggunaan air yang berkelanjutan. Pada penelitian ini analisis neraca air dilakukan pada daerah irigasi Sei Belutu, Kabupaten Serdang Bedagai. Komponen utama yang digunakan di dalam analisis adalah ketersediaan air yaitu debit andalan yang dihitung dengan menggunakan metode F. J. Mock, dan kebutuhan air irigasi yang terdiri dari kebutuhan air konsumtif tanaman, kebutuhan air untuk penyiapan lahan, kebutuhan air untuk penggantian lapisan air, perkolasi, curah hujan efektif, efisiensi irigasi, dan luas lahan. Hasil evaluasi neraca air diperoleh besar debit andalan terkecil 1,80 m3/dt pada bulan Agustus dan terbesar 12,72 m3/dt pada bulan Oktober, sedangkan besar kebutuhan air irigasi terkecil adalah sebesar 1,98 m3/dt dan kebutuhan air irigasi terbesar adalah sebesar 11,01 m3/dt. Kebutuhan air di pintu pengambilan lebih besar daripada ketersediaan air yang ada untuk seluruh alternatif pola tanam. Hal ini akan mengakibatkan kurang maksimalnya pengairan daerah irigasi Sei Belutu seluas 5025 Ha. Permasalahan yang menyebabkan terjadinya kekurangan suplai air di lapangan adalah keberadaan daerah irigasi Malasari dan daerah irigasi Martebing yang juga memanfaatkan air dari Sungai Sei Belutu. Oleh karena itu, perlu dilakukan peninjauan kembali dalam pemenuhan kebutuhan air irigasi di daerah irigasi Sei Belutu dengan mempertimbangkan perencanaan bendungan ataupun embung pada bagian hulu daerah irigasi
PEMBERDAYAAN KELOMPOK TUKANG BANGUNAN UNTUK MENGATASI RISIKO BANGUNAN RAWAN LONGSOR DI DESA PERKEBUNAN BUKIT LAWANG
No full textFollowing the flash flood in Bahorok in 2003, concerns about potential similar disasters in the future have been on the rise among both the community and the government. However, economic demands in the vicinity of the affected area have led the community to continue utilizing the riverbanks for building purposes, particularly for nature tourism. This land use has resulted in the narrowing of the river, leading to floods and landslides. Therefore, the less skilled construction workers, who are partners in this initiative, require assistance from the proposing team to provide training in building construction, especially in landslide-prone areas. This training is expected to be a solution to address the issue. Through the exchange of ideas with the proposing team, the partners can enhance their understanding of anticipating building damages due to errors in construction methods. After the training, the community will have a guide for planning and constructing buildings in landslide-prone areas, creating a safe and comfortable environment for both the local residents and tourists visiting Bukit Lawang
COMPREHENSIVE GEOTECHNICAL ANALYSIS OF LANDSLIDE RISK FACTORS: INSIGHTS FROM KARO REGENCY, NORTH SUMATERA, INDONESIA
No full textThis study explores geological and geotechnical factors impacting landslide risk inKaro Regency, Sumatera Utara, Indonesia, a region inherently susceptible tolandslides due to its volcanic terrain. Analyzing seven landslide sites, the researchcombines field slope geometry measurements and soil bulk density tests withdetailed laboratory investigations, including Triaxial Unconsolidated Undrained(Triaxial UU) testing. Findings reveal critical insights into soil behavior, stability,and variations in shear strength parameters. The Unified Soil Classification System(USCS) identifies prevalent soil types, dominated by poorly graded sands andgravelly sands. Triaxial UU testing exposes significant variations in shear strengthparameters, highlighting soil heterogeneity. This comprehensive study contributes togeotechnical engineering, emphasizing the need for tailored mitigation strategiesand multidisciplinary approaches in effective landslide risk management in KaroRegency
