The investigation of landslides applying various methods has been receiving increased attention in recent years. This study was aimed at assessing the estimated distribution of landslide movement using an energy conservation formula in a lumped mass model to obtain velocity and travel distance estimations, in combination with an inverted resistivity model for estimating the Amahusu landslide volume. The research location was in the Amahusu hills of the Nusaniwe subdistrict, Ambon, Indonesia. A survey was carried out using GPS and a geoelectric resistivity method with the Wenner-Schlumberger configuration. The results of the study provide a characterization of this rotational type landslide. The estimated landslide volume was 70,954 m 3 and the estimated potential landslide volume was 50,603 m 3 . This mass moved 303 m away from the original location, with an estimated maximum velocity of up to 21.25 m/s. The displacement pattern of a landslide mass is primarily controlled by the geometry of the sliding plane. The geometry of the sliding plane causes different types of movement, based on which the possible occurrence of a future landslide can be predicted.
Telah digunakan banyak metode untuk mengkaji permasalahan longsor dari sudut pandangan pendekatan satu-disiplin, interdisiplin maupun multidisiplin. Beberapa metode sedang dikembangkan untuk dipadukan dalam investigasi longsor selama dekade terakhir ini, fokus studi diarahkan menggunakan pendekatan investigasi multidisiplin seperti survei geolistrik, geoteknik dan geokomputasi untuk menentukan potensi longsor sehingga dapat meminimalisir bencana longsor. Hasil kajian memberikan bidang gelincir terletak pada kelompok resistivitas menengah dengan jenis pasir atau pasir lempungan yang menindih kelompok resistivitas tinggi yang berupa batulempung keras (<em>bedrock</em>). Berdasarkan nilai faktor keamanan lereng, bidang gelincir ini berada pada keadaan kurang stabil. Sedangkan penerapan geokomputasi menunjukkan lokasi kajian ditafsirkan berada dalam zona bahaya yang tinggi sehingga sangat berpotensi adanya longsor susulan. Dari hasil kajian terpadu, lokasi kajian masih dalam kondisi tidak aman dan bisa terjadi longsor susulan jika dipicu oleh faktor luar. Untuk meminimalisir longsor susulan dengan menurunkan muka air tanah adalah menggunakan model tol air dengan memanfaatkan sungai-sungai kecil/besar yang terdapat di bawah lereng/tebing untuk dapat dialirkan air pada musim hujan
Incoherent gamma ray scattering is a method that can be applied for the fluid parameter characterization. The aim of the present work is to study the potential usage of the incoherent gamma ray scattering measurements to evaluate the fluid density based on the Monte Carlo approach. Enlarging the density of a fluid results in a significant reduction in the intensity of the detected gamma scattering. The difference of the simulation curve slope results in the gamma transmission mode its about 0.02 compared to the experimental result.
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