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Journal : agriTECH

Efektivitas Grass Barrier (Rumput Penghalang) terhadap Pengendalian Erosi Angin Di Merapi Beny Harjadi; Pranatasari Dyah Susanti
agriTECH Vol 38, No 1 (2018)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (117.443 KB) | DOI: 10.22146/agritech.10745

Abstract

Mount Merapi eruption in 2010 that discharged more than 130 million m3 of landfill material brought impact on the thickness and height of caused damage to the yard and agricultural land. After mining heap of materials in the form of boulders, stones, gravels, and gravel to sand, RLKT activities (Rehabilitation and Soil Conservation) needs to be pursued to mobilize the people in the village of Kepuharjo. Cooperation between BPTKPDAS Solo with Kepuharjo Village community is incorporated in FPL PALEM (Environmental Care Forum Merapi Slope-Nature Lovers) by performing RLKT barrier in the form of grass planting (Grass Barriers) and manure treatment with the observation of surface erosion due to the effects of wind on the rorak. The purpose of this study was to quantify the effectiveness of grass barrier for wind erosion control at the land formerly affected by eruption at Merapi Mountain. The results show that the combination of grass and manure was able to suppress the erosion up to 88%. Effective rorak types were derived from bucket and it is not recommended that rorak includes a stick for a heap of unstable soil particles. Therefore, the usage of plastic is not suggested as it is easily torn. ABSTRAKBencana erupsi Gunung Merapi tahun 2010 telah mengeluarkan material lebih dari 130 juta m3 dan berdampak pada penimbunan material yang tebal dan tinggi, sehingga menyebabkan kerusakan lahan pekarangan dan pertanian. Setelah dilakukan penambangan, timbunan material berupa batu besar, batu, kerakal, kerikil sampai pasir, maka perlu diupayakan kegiatan RLKT (Rehabilitasi Lahan dan Konservasi Tanah) dengan menggerakkan masyarakat di Desa Kepuharjo. BPPTPDAS Solo telah bekerjasama dengan masyarakat Desa Kepuharjo yang tergabung dalam FPL PALEM (Forum Peduli Lingkungan-Pecinta Alam Lereng Merapi) dengan melakukan RLKT berupa rumput penghalang (Grass Barriers) dan perlakuan pupuk kandang dengan pengamatan erosi permukaan akibat pengaruh angin pada rorak. Tujuan penelitian ini adalah untuk menghitung tingkat efektivitas rumput penghalang terhadap pengendalian erosi angin pada lahan bekas erupsi di Merapi. Hasil yang diperoleh bahwa rumput dan kombinasi dengan pupuk kandang mampu menekan erosi sampai 88%. Jenis rorak yang efektif adalah rorak yang berasal dari ember. Tidak disarankan menggunakan rorak dengan stik di dalamnya karena timbunan partikel tanah disekitar rorak yang tidak stabil, ataupun dengan plastik karena akan mudah robek.
Identifikasi Karakteristik dan Faktor Pengaruh pada Berbagai Tipe Longsor Pranatasari Dyah Susanti; Arina Miardini
agriTECH Vol 39, No 2 (2019)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1011.314 KB) | DOI: 10.22146/agritech.40562

Abstract

Landslide disaster mitigation is necessary in areas vulnerable to this disaster. Banjarnegara is one of the regencies in Central Java Province with high ground movement potential, hence, it is prone to landslides. The aim of this study was to determine the characteristics and factors that influence the type of landslides in Banjarnegara District. The observation of the research was based on the results of landslide vulnerability analysis. Identification of the landslides characteristics, both in types and factors that influence them, are carried out by a survey method with a purposive random sampling technique by considering the locations that have experienced landslides, and the level of vulnerability to landslides. The survey was conducted using a landslide control card (KKL) which was compiled based on the factors that cause landslides. Scoring was done to determine the determinants of the landslide type quantitatively, on a scale of 1 to 5. The results showed that there were three types of landslides found in the study location, namely rotational slide, creep slide and flows. Factors that influenced rotational slide in the study site were slope, soil depth, faults, and infrastructure, while for creep slide were faults, slope, length of slope, and infrastructure. In addition, flows were affected by faults and infrastructure. The highest KKL value was 77 in the rotation landslide type and the lowest was 51 in the creep landslide type. Rainfall is also a trigger factor for the three types of landslides. It is highly recommended to do technical mitigation by observing the principles of soil and water conservation and high adaptation to the people living in this area.