Flash flood hazard areas assessment in Bandar Negeri Suoh (BNS) region using an index based approaches and analytical hierarchy process

Abstract

Flash flood led to high levels of water in the urban areas, causing many problems such as bridge collapse, building damage and the victim died. It is impossible to avoid risks of floods or prevent their occurrence, however, it is plausible to work on the reduction of their effects and to reduce the losses which they may cause. The objective of this paper is to generate a flash flood map in Suoh region, using satellite images, UAVs images and GIS tools. Analytical Hierarchical Process is used to determine the relative impact weight of flood causative factors to get a composite Flood Hazard Index (FHI). The causative factors in this study are flow accumulation (F), rainfall intensity (I), geology (G), land use (U), slope (S), and elevation (E). The presented methodology has been applied to an area in Suoh region, where recurring flood events have appeared. Initially, FIGUSE method resulted in an FHI and a corresponding flood map. A sensitivity analysis on the parameter’s values revealed some interesting information on the relative importance of each criterion, presented and commented in the discussion section.

Identification of Geodiversity and Geosite Assessment around Geohazard Area of Suoh Aspiring Geopark in West Lampung, Sumatra, Indonesia

“…Tectono-volcanic evolution has produced distinctive and unique geological features. Volcanoes, fault valley/fault depression, geothermal manifestations, and volcano-tectonic craters and lakes are some of the geological features that are formed [3,7,17,29]. These features were formed in line with the evolution of Sumatra Island from the Carboniferous Age to the present [16,19,22,25,30,31].…”

“…As a result, the notion of geoparks (geodiversity, biodiversity, and cultural diversity) is here to challenge the concept of economic progress, which conveys the objective of balancing the economy and expanding the economy in many areas [4,6]. Geopark development is one of the initiatives addressing the issues of creating locations with geodiversity, biodiversity, and cultural diversity [7]. Geoparks strive to protect natural diversity, educate the public about natural history, and assist the long-term economic growth of geopark areas, particularly through geotourism.…”

“…Indonesia currently has six global geoparks and thirteen national geoparks, as shown in Figure 1. Batur, Rinjani-Lombok, Gunung Sewu, Ciletuh-Palabuhanratu, Toba Caldera, and Belitong UGGp are the six world geoparks [7]. Ijen, Bojonegoro, Karangsambung-Karangbolong, Pongkor, Merangin, Silokek, Sawahlunto, Sianok Maninjau, Natuna, Meratus, Maros-Pangkep, Tambora, and Raja Ampat are thirteen national geoparks.…”

Mapping of GIS-Flood Hazard Using the Geomorphometric-Hazard Model: Case Study of the Al-Shamal Train Pathway in the City of Qurayyat, Kingdom of Saudi Arabia

“…A number of studies have used the multicriteria analysis method [21][22][23][24][25][26][27][28][29][30]. Hydraulic modeling using the HEC-RAS program is one of the most important methods used to model flood hazards in urban areas because it provides one-and two-dimensional models for the spread, depth, and speed of floodwater [6,9,[31][32][33][34][35][36][37][38][39].…”