Coral reefs contribute significant benefits in coastal area in Wangi-wangi Island, Wakatobi Keywords: coral reefs, geographic information system (GIS), Wangi-wangi Island ABSTRAKTerumbu karang mempunyai arti yang sangat penting oleh karena fungsi dan peranannya baik secara ekologis, sosial, dan ekonomis bagi biota lain dan kehidupan masyarakat yang berdiam di wilayah pesisir. Dengan demikian perlu mengetahui kondisi dan distribusi spasial tutupan terumbu karang di perairan Pulau Wangi-Wangi, Wakatobi. Pengamatan kondisi terumbu karang menggunakan metode Point Intercept Transect (PIT) dan analisis distribusi spasial terumbu karang dilakukan dengan menggunakan Sistem Informasi Geografi (SIG). Hasil penelitian menunjukkan kondisi terumbu karang di perairan Pulau Wangi-Wangi masuk dalam kategori sedang hingga baik. Persentase tutupan terumbu karang di lokasi pengamatan berkisar antara 28% -60%. Berdasarkan hasil analisis secara spasial, ternyata karang tersebar di lokasi Desa Waha, Desa Sombu, dan Pulau Kapota yang memiliki persentase tutupan karang non-Acropora lebih besar dibandingkan lokasi lainnya. Pada lokasi Desa Waha dan Desa Sombu juga dijumpai soft coral yang lebih banyak dibandingkan dengan lokasi lainnya.Kata kunci: terumbu karang, sistem informasi geografis, Pulau Wangi-wangi
This paper will describe a study to find out the shoreline changes that occurred on Cemara Besar Island along with the accretion and abrasion. Data taken from the images was obtained through google earth as a result of radiometry and geometry correction from Landsat satellites in the last 5 years. Wind data is obtained from ecmwf interm every season for 5 years. Analysis of shoreline changes was carried out using the DSAS (Digital Shoreline Analysis) method and analyzed by wind and sea wave factors in each season. The results of the analysis obtained LRR and EPR values for 5 years, the extent of changes in island land mass, the value of Hs and Ts from the results of wave forecasting using wind data. To simplify the analysis, Cemara Besar Island is divided into 9 segments based on variations in LRR values. The results show that in general Cemara Besar Island have very high accretion in segments A, B and E with an average of 3.61 m and very high abrasion occurred in segment F with an average of -1.01 m. Abrasion occurs with the greatest speed of change in segment A with an average of 4.64 m/year and the largest accretion rate in segment F with an average of -1.21791 m/year. Analysis of oceanographic factors through wave forecasting shows that in the west and transition I season, waves occur with Hs 1.21 m, greater than the eastern season and transition II season with Hs 0.91 m. wind direction from north dominant direction 377.50 in west season and transition I, and from east direction 67,25 in east season and transition I season. Direction of wind blowing influences wave propagation and direction of wave coming towards shore which affects sediment transport which produces accretion and abrasion on the Cemara Besar Island.
ABSTRAKArea gambut yang ada di wilayah pesisir memiliki peran ekologis yang penting sebagai penyimpan karbon, penyimpan air, konservasi biodiversitas dan aktivitas ekonomi masyarakat. Pengelolaan wilayah gambut dilakukan dengan memperhatikan keseimbangan faktor sosial, ekonomi dan juga lingkungan fisik. Makalah ini memaparkan usaha pengelolaan wilayah gambut di kawasan hidrologis gambut Sungai Katingan -Sungai Mentaya seluas 254.522 hektar yang ada di Provinsi Kalimantan Tengah. Metode kuantitatif-kualitatif melalui teknik GIS dan survey lapangan dilakukan untuk mendapat parameter terkait pengelolaan lahan gambut di lokasi studi. Upaya restorasi yang dilakukan oleh pemerintah ada tiga jenis yaitu melakukan rewetting di areal gambut yang berkanal dan pernah terjadi kebakaran, revegetasi bagi wilayah gambut yang tutupan vegetasinya sudah < 25% dan pembentukan desa-desa peduli gambut yang dilakukan melalui suatu pendekatan sosial pada masyarakat sekitar yang beraktivitas sehari-hari di kawasan gambut tersebut.Kata kunci: Pengelolaan wilayah gambut, restorasi gambut pesisir, pemberdayaan masyarakat, Kalimantan Tengah. ABSTRACTThe existing coastal peatlands area have an important ecological roles as carbon sinks, water storage, biodiversity conservation and economic activities. The management of the peatlands have to be done by considering the balance of social, economic and physical environment. This paper describes the peatland management efforts in the Katingan River -Mentaya River peat with the area of 254,522 hectares in Central Kalimantan Province. Qualitative quantitative methods through GIS techniques and field surveys were conducted to obtain parameters related to peatland management at the study site. The government's have a plan to do a restoration efforts with threetype ofactivities: rewetting in deep-seated peatlands and fires,revegetation for peatlands whose vegetation cover is <25% and the establishment of peatlandcare villages. All that efforts will be conducted through a social approach to the communities which have daily activities in the peatlands area.
Drowning is the leading cause of injury or death for children and teenagers. Designing a drowning detection device by implementing an Internet of Thing (IoT) is needed. An Early Drowning Detection System (EDDS) is a system that gives an early alarm to the guardians (parents and lifeguard) if the detector triggered an abnormal heartbeat and the victims are submerged under the water for a long time. A microcontroller was used to control the signal received from a pulse sensor and time for the signal lost under the water before it is transmitted to the access point. The access point acts as a data forwarding to the database via an internet connection. Universal Asynchronous Receiver/Transmitter (UART) 433MHz radio frequency transceiver has been used to create the wireless communication between drowning detection device and monitoring hub. A triggered warning signal will be transmitted to the guardians via Android apps and web page.
Pertumbuhan rumput laut jenis Eucheuma sp. dipengaruhi oleh faktor oseanografi meliputi parameter fisika, kimia dan biologi. Penelitian ini bertujuan untuk mengetahui distribusi spasial parameter fisiko-kimiawi perairan dan pengaruhnya terhadap produksi rumput laut Eucheuma cottonii. Distribusi spasial parameter fisiko-kimiawi perairan dianalisis menggunakan Analisis Komponen Utama (Principal Component Analysis, PCA). Hubungan antara parameter fisiko-kimiawi perairan dengan produksi rumput laut dianalisis menggunakan regresi linear berganda. Analisis distribusi spasial parameter fisiko-kimiawi perairan menghasilkan 3 kelompok utama, dimana pengaruh stasiun sangat dominan dalam pengelompokan tersebut. Parameter fisiko-kimiawi perairan memberikan karakteristik yang berbeda antara kedua lokasi pengamatan (Kecamatan Sanrobone dan Mangarabombang), hal tersebut ditunjukkan dari perbedaan nyata antara kandungan suhu, BOT, kedalaman, DO dan kecepatan arus. Dari hasil analisis regresi linear berganda diperoleh parameter kunci yang mempengaruhi produksi rumput laut pada kedua lokasi, yaitu suhu, BOT dan kedalaman untuk Kecamatan Sanrobone, sedangkan parameter suhu, DO dan kecepatan arus untuk Kecamatan Mangarabombang.
This study aims to explore students’ perceptions of the implementation of online learning during the pandemic in terms of gender perspective, ownership of social media, and duration of internet access. This research was conducted by a survey involving 87 students (P = 51% and L = 49%) in junior high school. Data were analyzed using Logit Value of Item (LVI) and Wright map combined with Logit Value of Person (LVP). Students’ perceptions were reviewed based on gender, social media ownership, and duration of daily internet access. The results showed that, in general, students have a positive perception of online learning. Based on gender, male and female students have almost the same positive perception of online learning. In terms of ownership of social media accounts, students with one account or two social media accounts have a perception of online learning above the average logit person. Most students who access the internet for more than 5 hours have a perception above the average logit person. Students whose internet access duration is 3-4 hours have a perception above the average logit person. So, gender, social media ownership, and internet access duration of 3-4 hours have positive perceptions of online learning.
Underwater wireless sensor network (UWSN) important to enhance the widely use of the application of the Internet of things (IoT) for underwater. Uses of the acoustics base of wave propagations are the best ways to establish the UWSN. But the unpracticality of the hardware due to the size and cost has limited the application of UWSN. Radio frequency (RF) wave propagation is the best way to overcome this situation. Low frequency of the RF wave is proven feasible and suitable for underwater communication. 433 MHz RF were chosen to measuring the underwater received power behavior between the transmitter node and receiver node based on different distance and depth. HC12 transceiver module was used as a transmitter and spectrum analyzer with the telescopic antenna was used as a receiver. The received power give a good reading when the transmitter note was at 0.5-meter depth with a maximum operating range within 12 meters from the receiver.
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