Tides are the rise and fall of sea level caused by the attraction of objects in the sky, especially the moon and sun, to the mass of seawater on earth. Tidal research is useful for providing information about the components and types of tides and predicting tides and for mitigating natural disasters. Tidal measurements were carried out in the Nasik Strait, Bangka Belitung using the Valeport 106 tool. Tidal data was processed using the Admiralty Method. The Admiralty method is a method used to calculate tidal harmonic constants from observations of water levels. With this method, it is possible to know the amplitude and phase difference of the tides, the value of the Formzahl number, and the type of tide. From the results of data processing and analysis, the value of the Formzahl number in the waters of the Nasik Strait is 11,454 and the tidal type is a single daily tidal type that only occurs at one high tide and one low tide in one day.Keywords: tides; tidal types; admiralty method; formzahl numberAbstrakPasang surut adalah naik turunnya muka air laut yang disebabkan oleh gaya tarik benda-benda di langit, terutama bulan dan matahari terhadap massa air laut yang ada di bumi. Penelitian pasang surut bermanfaat untuk memberikan informasi mengenai komponen dan tipe pasang surut serta memprediksi pasang surut serta untuk mitigasi bencana alam. Pengukuran pasang surut dilakukan di Perairan Selat Nasik, Bangka Belitung dengan menggunakan alat Valeport 106. Data pasang surut diolah dengan menggunakan Metode Admiralty. Metoda Admiralty merupakan metode yang digunakan menghitung konstanta harmonik pasang surut dari pengamatan ketinggian air. Dengan metoda ini dapat diketahui amplitudo dan beda fase pasang surut, nilai bilangan Formzahl dan tipe pasang surutnya. Dari hasil pengolahan dan analisa data diperoleh nilai bilangan Formzahl di perairan Selat Nasik yaitu 11,454 dan tipe pasang surut adalah tipe pasang surut harian tunggal yang hanya terjadi satu kali pasang dan satu kali surut dalam satu hari.Kata Kunci: pasang surut; tipe pasang surut; metode admiralty; bilangan formzahl
Mangroves are forest vegetation that grows between tidal lines so that mangrove forests are also called tidal forests. Mangrove ecosystems have high biodiversity. The mangrove ecosystem has a physical function to protect the coast from abrasion and erosion, this ecosystem also has ecological and economic value. The purpose of this study was to determine the condition and extent of mangrove distribution on the coast of Karawang Regency. The research was carried out on the coast of Karawang Regency from March to June 2021. The data used is primary data by directly observing the research location and secondary data using remote sensing data from the Landsat 8 satellite. Image data processing and analysis is carried out using the NDVI (Normalized Difference Vegetation Index) method which can create a boundary between mangrove and non-mangrove. With this method, it can be seen the changes in the mangrove distribution area from year to year. The results of data processing and analysis show that in 2013 the distribution of mangroves on the coast of Karawang Regency has an area of 207.88 km2, in 2016 it has an area of 357.22 km2 and in 2020 its area is 237.61 km2.
Kata kunci : abrasi, sedimentasi, arus, gelombang, pasang surut, remote sensing ABSTRACK The existence of the coastline in the northern part of Karawang Regency is very worrying due to abrasion and sedimentation where sea water that was far from the side of the road is now on the edge of the road and several areas along the coast have been damaged affected by the abrasion. The process of abrasion and sedimentation can be monitored by using Remote Sensing technology, which is technology that uses electro magnetic waves to produce images obtained from sensors carried by satellites with the physical properties of objects observed on the surface of the earth. The purpose of this study was to determine the process of abrasion and sedimentation that occurred in the Karawang regency coast by using remote sensing technology. Based on the results of data processing and analysis conducted in 6 subdistricts along the Karawang coast, abrasion and sedimentation have occurred, where 4 villages experienced abrasion while 2 villages experienced sedimentation. The largest area formed due to abrasion occurred in Sedari village covering 166,802 hectares and the largest area formed by sedimentation occurred in Muara Cilamaya village of 276,318 hectares. The fastest speed of abrasion process occurred in Sukajaya village by 10.00 meters / year while the fastest sedimentation process was in Muara Cimalaya village at 4.50 meters / year.
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