Coastal Processes and Longshore Sediment Transport Along Krui Coast, Pesisir Barat of Lampung

Longshore sediment transport is one of the main factors influencing coastal geomorphology along the Krui Coast, Pesisir Barat of Lampung. Longshore sediment transport is closely related to the longshore current that is generated when waves break obliquely to the coast. The growth of waves depends upon wind velocity, the duration of the wind, and the distance over which the wind blow called fetch. The daily data of wind speed and direction are forecast from European Centre for Medium-Range Weather Forecasts (ECMWF). This study examines for predicting longshore sediment transport rate using empirical method. The wave height and period were calculated using Shore Protection Manual (SPM) 1984 method and the longshore sediment transport estimation based on the CERC formula, which also includes the wave period, beach slope, sediment grain size, and breaking waves type. Based on the use CERC formula it is known that from the Southeast direction (Qlst(1) ) the sediment transport discharge is 2.394 m3/s, in 1 (one) year the amount of sediment transport reaches 75,495,718 m3/s. Whereas from the northwest direction of (Qlst(2)) the sediment transport debit is 2.472 m3/s, in 1 (one) year the amount of sediment transport reaches 77,951,925 m3/s

Study of Protection Structures Planning for Krui Beach, Pesisir Barat Regency, Lampung Province

Labuhan Jukung Beach is one of the beaches in Kru, which is located on Krui Bay, West Coast District. This beach is a tourist beach directly adjacent to the Indian Ocean, so it has a high wave. Based on wind data from 2008 – 2017 that be analyzed in this research, Krui Beach has extreme wave height (25th return period) as big as 6 meters in deep-sea water and 3.4m in shallow water, consequently Krui Beach has the potential to erode To resolve these problems, must be built environmentally friendly coastal protection structure. The structure that can be used in this beach is groynes. Groynes serve as sediment traps and existence of groin does not disturb tourists who surf the beach. Based on HWS value and run-up wave calculation, the groin structure need to has elevation +10.3m from seabed, with armor weight is 6.3 ton

Studi Pola Sebaran Tumpahan Minyak Dengan Aplikasi Model Hidrodinamika Dan Spill Analysis Menggunakan Software Mike 21 Di Perairan Selat Rupat, Provinsi Riau

Berbagai aktivitas atau kegiatan industri seperti transportasi, penyimpanan, pengolahan dan distribusi minyak yang dilakukan di sekitar wilayah Selat Rupat, Provinsi Riau rawan terhadap pencemaran tumpahan minyak.Tujuan dari penelitian ini adalah untuk mengkaji pola sebaran tumpahan minyak mentah (crude oil), avtur dan diesel dengan pendekatan model hidrodinamika dan spill analysis menggunakan software MIKE 21.Data yang digunakan mencakup data primer dan data sekunder.Data primer yaitu data arus laut, pasang surut, dan suhu air laut.Sedangkan data sekunder yaitu data angin, batimetri, data volume fraksi minyak dan data port information.Hasil yang diperoleh menunjukkan tipe pasang surutnya pasang surut harian ganda (semi diurnal) dengan nilai bilangan Formzhal 0,2287. Pola arus didominasi oleh arus pasang surut dengan kecepatan arus maksimum berkisar 0,9286 m/s dengan arah menuju timur Selat Rupat. Pola sebaran tumpahan minyak mentah (crude oil), avtur, dan diesel saat pasang bergerak ke arah timur Selat Rupat, sebaliknya pada saat surut bergerak kearah barat Selat Rupat. Minyak mentah (crude oil) memiliki waktu pemaparan yang lebih lama yaitu + 380 jam dibandingkan waktu pemaparan minyak avtur dan diesel yaitu+ 285 jam

Analisis Sedimen dan Pengaruhnya terhadap Kondisi Garis Pantai di Kawasan Pantai Timur Kabupaten Lampung Selatan

The erosion and sedimentation process that occurred in the east coast of South Lampung is a natural process affecting the balance of coastal sediment transport and resulting in the instability of coastal lines to the loss of the coastal communities along the coast, such as silting the river and can disturb the traffic of fishing boats. This is seen as a natural process influenced by the magnitude of wave energy coming, the type and size of sediment deposited, and coastal morphology. This research aims to analyze sediment and its effect on the changing coastline. The calculation approach with the empirical formula against coastal sediment data and wave data is used to predict the natural processes occurring along the coast. Analysis of SPOT 6/7 satellite imagery years 2008, 2013, 2016, and 2018 is the next step to estimate the similarity with empirical calculation results. The results showed that the East Coast had a characteristic mud sediment size ranging from 0.0258 – 0033 mm with the highest wave from the east with a wave height above 2.57 m and a period above 8,015 S. Research locations tend to undergo sedimentation processes that are influenced by waves, grain size, and there are rivers carrying sediments and deposits in the river estuary