Sembulang is located in a strategic maritime location and supports the majority of the local population to work as fishermen. In addition, Sembulang is also directly adjacent to the waters of Mubut Island which is one of the favorite tourist attractions in Batam and also to the waters leading to Bintan and Tanjungpinang, making it a popular port for people in that location. However, until now there has not been an official sea map or cruise line map for traditional fishing boats / local transportation to support economic and tourism activities there. The flow of a cruise is very closely related to the depth of a waters. Water depth data can be used by fishermen and boat captains as a reference when they are sailing across Sembulang Beach. The purpose of this study was to analyze the bathymetry conditions in Sembulang Beach, Galang, which were used as a reference for safe and efficient ship grooves considerations. Bathymetry mapping is done by using multibeam echosounder to create a seafloor topographic map at the research location which is then analyzed based on the depth and width of the cruise line which is ideal for the specifications of traditional fishing vessels. Based on the analysis that has been done, it can be concluded that only ships with size <5 GT with the form of "V" Pump Boat, "V", "V" High Bow, "V" Katir, "V" Without Katir, "U" Katir and 5 GTs with safe "U" and "V" shapes to be anchored at Sembulang pier. In other words, traditional fishing boats with a size of GT 10 GT are not recommended to dock at the pier.
One part of the hydrologic cycle which has a major influence in increasing the amount of river flow discharge is surface runoff. The higher surface runoff discharge, causing the possibility of surface flooding, therefore required an empirical model that can calculate the amount of surface runoff so as to produce updated data and quickly change according to their needs. One of the empirical methods that can be used to calculate the amount of surface runoff is by using the curve number method. This research is done by utilizing remote sensing image, that is, ALOS AVNIR-2. Data extraction from ALOS imagery includes land cover information using multispectral classification analysis, slope inclination information through visual interpretation, and land use interpretation. The runoff that occurred in Banjarnegara Regency tends to be high, that is, 61.24 percent of the total area of the research area. Large runoff with very high/extreme class spread on the form of hilly land to the old volcano complex at the study site. The runoff in the medium to low class only covers 3.56 percent of the total area and is distributed on the fluvial form with the flat-to-flat slopes. The result of analysis of runoff data is obtained from slope analysis and type of land use in the research location. Increasingly steep slope with little vegetation-land use, then the greater the runoff that occurs. Finally, the research result could be implemented into higher student class activity, especially in remote sensing classes, GIS, cloud computing, and big data analysis. By this process, the students will be improved their skills in analyzing imagery data as well as create new information derived from the remote sensing data.
Water destilator merupakan alat yang digunakan untuk menyuling air laut menjadi air tawar. Konsepnya sederhana dan serupa dengan siklus hidrologi, yaitu dengan menguapkan air laut dengan cara dipanaskan, yang kemudian uap air tersebut diembunkan dan dikumpulkan ke dalam suatu wadah penampung sehingga didapatkan air tawar. Sumber panas yang dipergunakan berasal dari energi yang beragam: minyak, gas, listrik, tenaga matahari dan lainnya, namun dikarenakan menerapkan konsep ramah lingkungan alat ini hanya mengandalkan cahaya matahari sebagai energinya. Alat destilator ini adalah alternatif sederhana yang ekonomis dan dapat digunakan dalam skala rumah tangga serta ramah lingkungan. Alat ini merupakan pengganti sistem destilasi pabrik dengan harga yang relatif mahal dan masih sulit dijangkau oleh penduduk Indonesia. Jenis teknologi tersebut cukup sulit karena teknologinya rumit dan membutuhkan investasi dan estimasi dana yang tinggi dalam skala rumah tangga. Destilasi dapat terjadi dengan memanfaatkan potensi alam yaitu sinar matahari menggantikan bahan bakar minyak dan gas alam untuk mengubah fase uap air laut. Karena suhu yang diperlukan untuk mengubah fase air laut menjadi uap tidak terlalu besar (dibawah 100oC) atau di bawah satu tekanan atmosfir (1 atm), maka pemanfaatan energi matahari adalah solusi alternatif yang dipilih sesuai dengan kondisi Indonesia yang terletak pada daerah katulistiwa dan beriklim tropis mempunyai jumlah sinar matahari yang cukup.
Kiblat merupakan pusat arah bagi Umat Muslim dalam mengerjakan ibadah sholat. Di daerah khatulistiwa seperti Indonesia, kesalahan penentuan arah kiblat sebesar 1o saja dapat menjadikan arahnya menyimpang sejauh 111 km dari Ka’bah. Kegiatan pengabdian ini bertujuan untuk mensosialisasikan metode penentuan arah kiblat dengan teknologi survei pemetaan, yaitu Total Station, sekaligus bersama-sama dengan masyarakat setempat melakukan kegiatan pengukuran di lapangan. Kegiatan pengabdian akan terlaksana dalam dua tahap yaitu persiapan (pra pelaksanaan) dan pelaksanaan di lapangan. Kegiatan pra pelaksanaan meliputi survei lokasi dan persiapan peralatan yang akan digunakan di lapangan. Dengan menggunakan prinsip perhitungan segitiga bola dalam ilmu Matematika Geodesi dan memanfaatkan perkembangan teknologi penentuan posisi secara akurat, Total Station dan kompas digunakan untuk mengukur arah kiblat setelah sebelumnya dilakukan koreksi arah utara sejati dengan bantuan benda langit seperti matahari. Dengan demikiran, hasil pengukuran yang didapatkan akan memiliki akurasi yang baik. Dari pengukuran arah kiblat yang telah dilakukan di masjid Nurus Sabil, diperoleh sudut arah kiblat dari utara ke barat sebesar 66o 50’ 59.83” atau azimuth kompas sebesar 293o 9’ 0.17”. Berdasarkan hasil perhitungan tersebut terdapat perbedaan azimuth sebesar 12° dari azimuth/ arah kiblat awal masjid disana. Hal ini terjadi karena memang masjid tersebut dari awal berdirinya belum pernah dilakukan penetapan dan penegasan arah kiblat secara teliti dan resmi.
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