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All Journal MANAJEMEN HUTAN TROPIKA Journal of Tropical Forest Management Jurnal Imajinasi Indonesian Journal of Forestry Research Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) MEDIAN Wood Research Journal : Journal of Indonesian Wood Research Society Wood Research Journal : Journal of Indonesian Wood Research Society
Wahyudi, Wahyudi
Department Of Wood Science And Forest Products Faculty Of Forestry, The State University Of Papua Manokwari 98314, West Papua
Agriculture, Biological Sciences & Forestry Arts Humanities Earth & Planetary Sciences Environmental Science Other

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Biophysical characteristics of Wosi Watershed area in Manokwari Regency, Indonesia Mahmud; Abdul Aziz; Danang Wijaya; Wahyudi; Bambang Nugroho; Denisa Melanesia
Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Vol 13 No 1 (2023): Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (JPSL)
Publisher : Pusat Penelitian Lingkungan Hidup, IPB (PPLH-IPB) dan Program Studi Pengelolaan Sumberdaya Alam dan Lingkungan, IPB (PS. PSL, SPs. IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jpsl.13.1.88-101

Abstract

Flood is number one Indonesian natural disaster in the last 10 years and its occurrence at Manokwari is frequently reported. Biophysical condition is playing a key role in carrying capacity of this catchment area.This study is to determine biophysical characteristics of Wosi Watershed to manage and mitigate flooding in Manokwari. Spatial analysis and field observation methods were used to collect the data. Biophysical variables are rainfall, watershed morphometric, slope, and land used. Carrying capacity is measured using flow regime coefficient and annual flow coefficient. The results showed that the heavy rainfall (> 100 mm) throughout the ten years with 10.5 wet months at average resulting very wet tropical climate. This watershed has an area of 2,346.32 ha, its circumference of 29.95 km2 with river length of 8.38 km resulting 0.33 (triangle) and 1.027 (triangle) for Rc and Re, respectively. This morphometry is rectangular and slightly oval(triangular) formed of four rivers with drainage pattern of dendritic, which resembles the shape of a tree branch/twig. Steep slopes are dominant (58.5%), with non-forest area (62%) of the flat and steep slope for settlement (698 ha), and flat slope for mixed dry farming (707 ha). From 2016-2020, river water flow changes rapidly from low to very high to generate flooding, but the carrying capacity is sometime changeable from good to bad. Water drainage, retaining walls, replantation, early warning system, and flooding leaflets mitigation campaign, are structural and non-structural mitigation could be parallelly conducted to manage and mitigate the flooding risks in future.
Co-Authors - Mahmud Abdul Aziz Ana Tampang Ana Tampang Bambang Nugroho Bambang Nugroho Chao Nan Wang Danang Wijaya Denisa Melanesia Donny Aristoe Djitmau H. Ichiura Heru Joko Budirianto Hideaki Ichiura Kasmudjo Kasmudjo Mahmud Mahmud Max Jondudago Tokede N. Kaushalya Herath Novita Yogi Reinardus Liborius Cabuy Rini Pujiarti Sasarari Yuliana Titis Budi Widowati Y. Ohtani Yohanes Taam Yoshito Ohtani Yoshito Ohtani Zulfikar Mardiyadi