ABSTRAKArtikel ini dilatarbelakangi oleh penurunan daya dukung lingkungan dalam ekosistem DAS, terutama pengaruh perubahan vegetasi hutan terhadap perilaku aliran. Indikator kerusakan lingkungan DAS terhadap perilaku hidrologi dapat ditelusuri melalui karakteristik hidrograf. Evaluasi respon DAS dari hidrograf aliran menjadi sangat penting untuk dianalisis karena merupakan tolok ukur dalam penentuan kebijakan pengelolaan permasalahan lingkungan yakni banjir, kekeringan, sedimentasi dan tanah longsor. Tujuannya untuk menganalisis hubungan antara indeks vegetasi NDVI (Normalized
Modeling is one of the methods in the portfolio of techniques and approaches available to unravel the dynamics of the land-use system. In this perspective, models are used as a learning and communication tool between researchers to formalize knowledge on the dynamics of land-use change. Land-use system is a very complex system, such that computer modeling is needed as a computational laboratory to estimate and test hypotheses about the process of land-use change. One of the major difficulties in multi-disciplinary research is to find ways to express oneself, which are acceptable to all the disciplines involved and free from the connotation of any or all of them. Land-use change models play an important role in exploring possible future developments in the land-use system. This paper attempts to show the methods and approaches to be used as a communication and learning environment for stakeholders involved in the decision making about land-use change systems in the field of environment
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.
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