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All Journal Jurnal Ilmu Pertanian Indonesia Indonesian Journal of Geography Geoplanning : Journal of Geomatics and Planning Jurnal Penelitian Hasil Hutan Journal of Degraded and Mining Lands Management agriTECH Forum Geografi Jurnal Penelitian Sosial dan Ekonomi Kehutanan Jurnal Penelitian Pengelolaan Daerah Aliran Sungai Jurnal Penelitian Hasil Hutan Jurnal Ilmu Kehutanan Jurnal Penelitian Hasil Hutan
Pranatasari Dyah Susanti
Balai Penelitian Teknologi Kehutanan Pengelolaan Daerah Aliran Sungai Kementerian Lingkungan Hidup Dan Kehutanan
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Energy Environmental Science Materials Science & Nanotechnology Social Sciences

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Determination of cumulative rainfall threshold trigger of landslides in Grindulu watershed as an early warning effort Miardini, Arina; Susanti, Pranatasari Dyah
Journal of Degraded and Mining Lands Management Vol. 7 No. 2 (2020)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2020.072.2059

Abstract

Landslides are one of the natural disasters that cause severe damage to life. The frequency of landslide has increased with global climate change and population growth, so early warning efforts are needed. Rain is a trigger factor for landslides can be used as an approximate model for disaster prevention and mitigation through the estimation of rainfall threshold. The purpose of this study was to determine the characteristics and threshold of rainfall that triggered landslides in the Grindulu watershed. The method used is the Cumulative Rainfall Threshold (CT), this method compares the amount of rainfall for the last 3 days (72 hours) with rainfall 15 days before. In the Grindulu watershed, landslides occur during 3-day cumulative daily rains ranging from 23-464 mm, whereas in the 15 days before the events range between 67-756.5 mm. Estimates of lower threshold rainfall are determined linear so that the equation P3 = 0.4675 P15-46.9 is obtained with the value R2 = 0.5774The threshold value of rainfall triggers a landslide in the Grindulu watershed when the cumulative rainfall of 3 days is 40 mm and 15 days before the event is 320 mm. The determination of rain threshold is expected to increase community preparedness for landslides.
Evaluation of water quality in the swamp river border using water quality index Anggana, Alvian Febry; Susanti, Pranatasari Dyah
Journal of Degraded and Mining Lands Management Vol. 7 No. 4 (2020)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2020.074.2373

Abstract

 As a source of minerals, water must be continuously maintained, including in term of its quality. Meanwhile, swamps are wetlands that have the potential to experience a decline in water quality. The presence of river borders in swamps has been known to maintain their water quality. Vegetation cover of the river border is established through restoration activities in which it is expected, directly and indirectly, to improve water quality. This study aimed to investigate the water quality in swamp using the Water Quality Index (WQI). Surveys were carried out and samples were collected to determine the effect of restoration on river border in swamps. Samples were collected severally, namely prior to restoration (T0), first year (T1), third year (T3) and fourth year (T4) after restoration. The parameters for water quality of T0 and T1 include pH, DO, BOD, TDS, turbidity and nitrate, while for T3 and T4 include: pH, DO, BOD, TDS, temperature, phosphate, E. coli and nitrate. The findings indicated that the WQI of the swamp prior to restoration was greater than that at the first year of restoration due to the process of land clearing. Meanwhile, the WQI at the third year has improved compared to before the restoration and land clearing phase. It suggests that the presence of vegetation on river border is able to improve the water quality. At the fourth year, a fire in the upstream reached the area adjacent to the study site. It led to a decline in surface water quality and affected the water quality index. Furthermore, the abundance of aquatic biota was indicated by two taxa of zooplankton in the third year of restoration while none of them was identified in the fourth year. In overall, restoration activities on the river border improve the quality of water in swamps in a sustainable manner.
Co-Authors Adnan Ardhana Adnan Ardhana Adnan Ardhana Agus Wuryanta Alvian Febry Anggana Anggana, Alvian Febry Arina Miardini Arina Miardini Arina Miardini Arina Miardini Arina Miardini Arina Miardini Arina Miardini, Arina Baharinawati Wilhan Hastanti Beny Harjadi Beny Harjadi Nining Wahyuningrum Reni Setyo Wahyuningtyas Reni Setyo Wahyuningtyas Reni Setyo Wahyuningtyas Wawan Halwany Wawan Halwany