Pengelolaan Risiko Banjir Lahar Hujan Gunungapi Semeru Sektor Tenggara, Lumajang, Jawa Timur

Sabtu, 4 Desember 2021, Gunungapi Semeru mengalami erupsi memuntahkan material awan panas guguran dan banjir lahar hujan ke sekitar Sungai Besuk Kobokan di Kecamatan Pronojiwo dan Candipuro. Banyaknya korban yang jatuh pada erupsi Gunungapi Semeru 2021 diakibatkan karena adanya pusat aktivitas masyarakat di sekitar Sungai Besuk Kobokan serta kurangnya peringatan dan pengetahuan masyarakat akan pengurangan risiko bencana. Penelitian ini dilakukan untuk mengupayakan pengelolaan risiko bencana di sub urusan sistem peringatan dini banjir lahar hujan Gunungapi Semeru. Fokus penelitian ini ada pada layanan pemantauan bahaya pada beberapa parameter yang mempengaruhi terjadinya banjir lahar hujan berbasis infrastruktur Internet of Things dan cloud computing yang akurat dan real-time

Penentuan Kebutuhan Air Baku Untuk Hunian Tetap Penyintas Erupsi Gunungapi Semeru

The Semeru Volcano eruption in 2021 has a wide impact on aspects of community livelihoods in Supiturang Village, Pronojiwo Subdistrict and Sumberwuluh Village, Candipuro Subdistrict, Lumajang, East Java and forced 1,951 survivors to be relocated to the Sumbermujur Village shelter. It is suspected that there is a lack of studies on the planning for the development of shelters, especially in matters of meeting the needs of raw water. The method of implementing community service is carried out using research methods to ensure the availability of raw water sources needed by 1,951 families who will live in shelters. From the identification results, the total need for raw water in the shelters in Sumbermujur Village reached 305.663.17 liters/day. From the interviews, there are 3 springs which are the main supply of raw water for temporary shelters with a total discharge of 35 liters/second or 126,000 liters/day. There is a deficit between the availability and the need for raw water for survivors in the shelters of up to 58.78%. The results of the identification of groundwater aquifers using the geoelectric resistivity method indicate that the deep aquifers around the huntap tend to be unproductive and economical to be used on a large scale, while the aquifers that allow for use are shallow aquifers at a depth of 8 – 18 meters with sustainable management efforts. The sustainable effort is in the form of planting groundwater by maintaining or adding green areas and making biopore holes or wells. With the aim that surface water can be channeled into the soil through trees and biopores, and maintain the capacity of the aquifer to minimize the risk of dryness

PENANGANAN AMBLESAN SUMUR DESA JUNGKARE KECAMATAN KARANGANOM, KABUPATEN KLATEN, JAWA TENGAH

Until the initial assessment was conducted at least 12 wells of residents of Jungkare Village, Karanganom Subdistrict, Klaten Regency, Central Java experienced subsidence. Various theories and hypotheses have been put forward by observers and disaster experts to answer the phenomenon. These theories and hypotheses need certainty so that the public can prevent and mitigate the phenomenon. Geological, geophysical, and social studies are participatoryly carried out in the hamlets in Jungkare Village that experience the phenomenon of subsidence wells on the southeast side of Mount Merapi. Preliminary results of the study concluded that (1) the sinking of the well occurred due to the collapse of the well wall due to the unstableness of the well wall; (2) This instability occurs due to the saturation of the building material of the well wall by rising groundwater level, excessive water addition causes the toughness of the wall to disappear, (3) the pattern of subsidence in more detail depending on the geological order, (4) the pattern of subsidence in more detail depending on the depth of the aquifer, the structure of the well mouth, the structure of the well's sedimentation, and the magnitude of mat changes. Researchers recommend; (1) to carry out the subsidy and compaction of wells that have been flooded; (2) strengthen the stability of the well wall by installing concrete buses on the entire well wall; (3) make an alternative pump well with piping