Shallow Coastal Carbonate Sediment Mapping for Biomimetics MICP, Case Study of Indonesia Beachrock, Yogyakarta

Abstract

Abstract The nomenclature for beachrock sedimentary has been in scientific discussions prior to the notable methodology of sustainable cementitious binding material based on microbially induced calcium carbonate (MICP). Typically, coastal erosion mitigation involves modifying surface conditions using materials like concrete, among other materials. This study aims to challenge the conventional practice by evaluating the feasibility of expeditiously constructing artificial beachrock utilizing natural components (e.g., microbes, sand, shells, coral fragments, seaweed, etc.) and propose it as an innovative coastal protection strategy. The primary focus of this research is to characterize the Java South coast, specifically Parangtritis Beach and Krakal-Sadranan Beach, where beachrock formations are present. Subsequent investigations were conducted to (i) identify occurrences of beachrock deposits in Krakal-Sadranan, Yogyakarta, and (ii) develop cementation method based on ureolytic bacteria derived from naturally formed beachrock as an alternative technique for stabilizing sandy coastal environments. The experiment employed bacteria isolated from the Yogyakarta coast (Pseudoalteromonas tetradonis). The outcomes revealed that the sample treated with a gradually injected cementation solution achieved an approximate strength of 10 MPa after a 14-day treatment.