The Center of Disaster Study of Universitas Hasanuddin (UNHAS)conducted a preliminary survey of the causes and strategies for mitigation of the flood that struck Masamba, North Luwu Regency, South Sulawesi Province since Monday (07/13).
The first step of The Center for Disaster Studies is to form an integrated team to conduct a preliminary scientific study of the causes and strategies for flood mitigation.
The survey aims to collect the field data, especially geomorphological, lithological or rock data (weathering conditions), and geological structures and hydrogeological data. The team was led directly by the Head of Disaster Study Center of Unhas, Prof. Dr. Eng. Ir. Adi Maulana, ST., M. Phil.
Prof. Adi Maulana explained the steps to meet the completeness of the data, the team conducted interviews with several communities related to disaster events.
To add analysis and to support interpretation, the study will be equipped by map analysis using the GIS method sourced from several digital maps and other thematic maps, such as geological maps, geological structure maps, geomorphological maps, and land use maps.
"The team has been deployed to the field since Friday, July 17, 2020 to collect data. They will be in the field for five to seven days. In addition to reviewing and taking data at several points in three overflowing watersheds namely Rongkong, Meli and Masamba Rivers, the team also conduct a survey of other major rivers in the vicinity, "explained Prof. Adi.
Furthermore, Prof. Adi added that the team took samples of sediment material from flash floods to conduct laboratory research on the origin of the sediment material. It is important to determine scientifically from the originating sedimentary material rocks.
By knowing the type of sediment material precipated by the flood, the type of rock origin will be known and in the end can provide important information about the causes of flash floods.
"At this time, we are also collecting rainfall data, climate data, and also time series digital map data for 30 years to get comprehensive information about what is happening in the affected area. This data will be processed as a source of information on how much the influence of global climate change and whether there is a local weather anomaly that affects the flood cycle, " added Prof. Adi.
Based on these observations, it can be predicted and simulated the flood pattern in the future. In addition to conducting studies to assess the causes, the team also conducted a preliminary study of flash flood mitigation or prevention strategies.
Geologically, Masamba watershed which stretches about 50 km x 30 km is the flood plain and deltas of several large rivers flowing from the north. This condition makes the area very vulnerable to flood disasters, especially flash floods.
"Flood like this will continue to occur, along with weather anomalies that occur lately due to the influence of global climate change. The concept of mitigation that will be reviewed includes both structural and non-structural concepts. This concept will become a recommendation to stakeholders, especially the government, as a reference for handling flood disaster," added Prof. Adi.
After these preliminary data have been collected, The Center of Disaster Study will release the results of the study and provide a scientific explanation and will be presented at an international conference at Unhas in August. (* / Mir)
Editor: Ishaq Rahman, AMIPR
Head of sub-directorate of Public Relation and Information
Directorate of Communication Hasanuddin University
Translator: Kumara Tungga Dewa and Karmila Mokoginta