Liquefaction Vulnerability Analysis as a Coastal Spatial Planning Concept in Pariaman City – Indonesia

Abstract

Knowledge about the liquefaction vulnerability in Pariaman city which is prone to an earthquake is very much needed in disaster mitigation based spatial planning. This research was conducted by analyzing the potential of liquefaction vulnerability based on the Conus penetration to produce Microzonation of the susceptibility of subsidence due to liquefaction at 4 locations in Pariaman city, i.e Marunggi village, Taluak village, Pauh Timur village and Padang Birik-Birik village. Based on the results of the analysis using this method, the critical conditions of liquefaction found in the intermediate sandy soil to solid. The fine sand layer which has the potential for liquefaction is in sand units formed from coastal deposits, coastal ridges and riverbanks. This liquefaction vulnerability zones analysis is limited to a depth of 6.00 m due to the limitations of the equipment used. The results of the analysis show that the fine sand layer which has the potential for liquefaction occurs at a depth of> 1.00-6.00 m with the division of zones, i.e 1) High liquefaction in the sandy soil layer which has a critical acceleration (a) <0.10 g with shallow groundwater surface; 2) Intermediate liquefaction in the sandy soil layer which has a critical acceleration (a) between 0.10-0.20 g with shallow groundwater surface; and 3) Low and very low liquefaction in the sandy soil layer which has a critical acceleration (a) between 0.20-0.30 g with an average groundwater deep enough surface

Sustainable Development-Based Coastal Management Policy Development: A Literature Review

“…Islands" (Yenida & Saad, 2018;Hermon et al, 2018 andWei et al, 2021) stated that the coastal region and small islands are divided into four zones, namely the core zone, protection zone, utilisation zone, and residential zone. Furthermore, Hermon et al (2019; explained that Pariaman City is one of the most densely populated cities on the coast of the western part of Sumatra Island and is one of the areas that are very vulnerable to tsunami disasters. As a newly developing city, Pariaman City needs to plan a coastal area layout that takes into account the convenience of the local community and visiting tourists.…”

Estimated Carbon Stock In The Mangrove Sylvo-Ecotourism Area, Tanjung Piayu Village, Sei Beduk District, Batam Island, Indonesia

“…The ecological function of mangrove ecosystems is very distinctive and its position is not replaced by other ecosystems [1]. In addition, mangrove ecosystems also have physical functions to maintain the coastline to remain stable, and protect the coast from abrasion, as well as biological functions as nurturing areas, foraging areas, and spawning areas of various marine life, and economic functions as sources of livelihoods including sources of fuel (wood), building materials (boards) as well as textile, medicine and food materials [2,3]. As a forest area in the middle of the city center, Tanjungpiayu mangrove forest plays a role for the lungs of the city which provides oxygen and absorbs carbon dioxide which contributes to the reduction of greenhouse gases.…”