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 Regresi pada Tren Perubahan Garis Pantai di Pantai Krui dari Digitasi Citra Landsat

Krui is a capital of Pesisir Barat Regency of Lampung Province which has important values on residential areas, business centers, government centers, and tourism destination. Kruis coast is adjacent to the Indian Ocean, which has the high wave characteristic cause the dynamic coastal process similarly to other sandy beaches on the west coast of Sumatera Island. The coastal process can be shown in the form of either coastline accretion due to sedimentation or shoreline reduction caused by the phenomenon of erosion and abrasion. The coastal process can be observed as a natural process to achieve an equilibrium of sediment transport along the coast. Also, Shoreline change is influenced by the height waves and the direction of incoming waves towards onshore depending on the season. The aims of this study is to get an overview of the shoreline changes that occur on the Krui Coast. Then it can be predicted the position of the coastline in the future. The regression model was chosen to estimate the position of shoreline in the future by utilizing a set of time-series data that refers to shoreline change within certain periods. Digitized Landsat-7 ETM+ satellite imagery is conducted in order to obtain shoreline position data in every year determinate as historical data. Based on this study, the rate of shoreline change in Krui Coast is within range of 0,12 meters/year to 41,35 meters/year, where is the shoreline change tends to increase. Keywords: Digitization, Landsat, Shoreline, Regressio