Small island watershed morphometric and hydrological characteristics in Ambon Region, Maluku Province

Abstract

With a relatively limited catchment area, the small island has special hydrological conditions. The hydro-morphometric approach of a watershed is essential for tracking and analyzing seasonal changes in small island watersheds’ hydrological characteristics. It is crucial to incorporate the hydrological elements of small islands, both geographically, ecologically, socio-culturally, and economically. Therefore, this study seeks to examine the morphometric and hydrological characteristics of small island watersheds in the Ambon Region, Maluku province. A geographic information system and the BFI + 3.0 digital recursive filtering method (RDF) are used in the research method. The findings showed that drainage density, bifurcation ratio, and bifurcation ratio significantly impacted water systems for watersheds, flood vulnerability, and river beds storage. Good drainage (Dd greater than 1–5) is included in drainage density. With very high flood levels and short recession periods, a riverbank ratio of less than 1 suggests rare watershed circumstances. This condition appears to have an increased vulnerability to flooding, marked by high runoff but low penetration and permeability. The bifurcation ratio shows that showing high peak discharge (Qp) and increasing times and rapid recession times, the watershed form appears to be rounded.

Forty Years of Soil and Water Conservation Policy, Implementation, Research and Development in Indonesia: A Review

“…41 of 2000 [85]. Watersheds of the small islands are characterized by a relatively short length of the main river, and the water mostly flows directly to the sea [86]. Water-related issues on small islands are water shortage and groundwater quality [87][88][89][90][91] due to limited water storage capacity [92], geological characteristics, lack of land cover [93], and narrow areas of rainwater catchment [86].…”

Baseflow separation using graphic method of recursive digital filter on Wae Batu Gajah Watershed, Ambon City, Maluku

“…In the last five years, the potential for widespread flood hazards for Ambon Island has experienced flooding and landslides with the impact of infrastructure damage, fatalities, and deaths relatively high. The possibility of residents being exposed to flooding in the five watersheds of Ambon City is relatively high due to the condition of the river border protection area crowded with settlements, and the number of vulnerable groups is high [1]. The study of hydrometeorology of watersheds such as densely populated cities becomes a need for watershed-based regional development.…”

Analisis Pemangku Kepentingan (Stakeholder) Terhadap Pengelolaan Sumberdaya Air Das Wae Batu Merah Kota Ambon

“…: a) sebelah Timur dan berbatasan Laut di sebelah Selatan dan Negeri Kilang di Sebelah Barat.Aksesibilitas DAS Wae Batu Merah memiliki jarak tempuh menuju lokasi Negeri Batu Merah yaitu + 5,9 km dari Kecamatan Sirimau dengan kondisi jalan aspal yang dapat dilalui transportasi roda dua dan empat(Latuamury et al, 2021a). DAS Wae Batu Merah dengan posisi demikian, memiliki peran sangat penting sehingga banyak para pihak (Multistakeholder) yang mempunyai kepentingan dan pengaruh yang kuat dalam pengelolaan DAS tersebut.…”