No abstract

Aerial photogrammetry is one of the Alternative technologies for more detailed data, real time, fast and cheaper. Nowadays, many photogrammetric mapping methods have used UAV / unmanned drones or drones to retrieve and record data from an object in the earth. The application of drones in the field of geospatial science today is in great demand because of its relatively easy operation and relatively affordable cost compared to satellite systems especially high - resolution satellite imagery.  This research aims to determine the stage or overview of data retrieval process with DJI Phantom 4 (multi - rotor quad - copter drone) with processing using third party software. This research also produces 2 - dimensional high resolution image data on the research area. Utilization of third party software (Agisoft PhotoScan) making it easier to acquire and process aerial photogrammetric data. The results of aerial photogrammetric recording with a flying altitude of 70 meters obtained high resolution images with a spatial resolution of 2 inches / pixels.

Punggur sea has many habitats, object, and structured of seabed with hight tide and wave. Side scan sonar is an underwater acoustic instrument for identification of seabed. This research aims to classify types of seabed and measure seabed identification into the sea water with grain size (dB), location, altitude (m) and target using side scan sonar instrument. This research also uses one types of side scan sonar in one places with 3 line of collecting data to get more variant seabed. Side scan sonar data of 20 km of side-scan sonar profiling (CM2, C-MAX Ltd, UK) with altitude max 20 m and a working acoustic frequency of 325 kHz with the zone is taken in the punggur sea (104°08.7102 E, 1°03.2448 N until 1°03.3977N 104°08.8133 E). The data side scan sonar processed using max view software to display the image of the seabed. Results of seabed imagery in the punggur sea on track 1 have Objects found on the ship coordinates 03.3101N 1 ° and 104 ° 08.7362 E with the highest gain value is 6 dB, altitude 18 m on ping 75. Linear regression has y = 0.7016x+12.952 with R 2 = 0.4125 (41%). Track 2 has target 1 is the sunken object on the seabed, while objects in the form of sand can be seen clearly. Objects found on the sunken object coordinates 1°02.8143 N ° and 104°08.5228 E with highest gain value is 9 dB with altitude 17.7 m and data ping 69. Linear regression has y = 0.2093+12.577 with R 2 = 0.2093 (20%). Track 3 has Target 1 is the ship object on the seabed, while objects in the form of sand can be seen clearly. Objects found on the sunken object coordinates 1°02.5817 N and 104°08.7337 E with the highest gain value is 8 dB with altitude 16.5 m and data ping 3984. Linear regression has y = 0.5106x +12.84 with R 2 = 0.5106 (51%). Track 1 has many targets identification results compared Track 2 and 3.

Since 2014 sedimentation at the estuary of Jelitik river, Sungailiat, Bangka has continued to increase. At this estuary, the ship traffic is very busy and there is National Fisheries Port Sungailiat. When the tide is low, the river mouth closes thus disrupting ship traffic. The Bangka Belitung Provincial Government is currently planning to build a sediment control infrastructure to reduce the sedimentation rate. To plan and determine the effectiveness of the jetties requires knowledge of sedimentation patterns around Jelitik estuary. Therefore this study was conducted to determine the pattern of sedimentation (distribution and rate) at the existing and ultimate conditions. The methods are field survey, analysis of field data, and computational modeling of sediment transport. Modeling of sediment transport was done using the Sand Transport Module of MIKE 21. Two scenarios were simulated for the existing and ultimate conditions. Based on this modeling, the sedimentation rate at Jelitik estuary is found uneven. In the existing condition, a large rate of sedimentation occurs on the southern side of the Jelitik River estuary, which reaches a maximum value of 2.75 m/year, with an average of 4.44 cm/year. Whereas in the ultimate condition, the sedimentation rate decreases to 0.0377 m/year.

NCICD is one of the national strategic programs to deal with coastal problems in Jakarta. One alternative structure to be built is WLP or known as coastal resort. As an initial step to make it happen, BAPPENAS plans to build a WLP pilot plan around the S. Cisadane estuary. One of the main considerations for designing the WLP layout is the process and pattern of sedimentation around the Cisadane estuary. Therefore, computational modeling of sediment transport around the Cisadane estuary was carried out for a period of 1 year (August 2020-July 2021). This modeling uses MIKE-21 module MIKE21/3 Integrated Models software which combines hydrodynamics and cohesive sediment transport models. Based on the results of this modeling, it is known that there are differences in sediment transport patterns in the west and east monsoons. During 1 year, changes in the thickness of the bottom sediment around the estuary of S. Cisadane ranged from -0.4 to 0.7 m with a mean of 0.086 m. Coastal reservoir design must take into the very dynamic sedimentation process around the Cisadane estuary.   Pengembangan Terpadu Pesisir Ibukota Negara (PTPIN) merupakan salah satu program strategis nasional untuk menangani permasalahan pesisir di Jakarta. Salah satu alternatif struktur yang akan dibangun adalah WLP atau dikenal sebagai coastal reservoir. Sebagai langkah awal mewujudkannya BAPPENAS merencanakan membangun pilot plan WLP di sekitar muara S. Cisadane. Salah satu pertimbangan utama untuk mendesain layout WLP adalah proses dan pola sedimentasi di sekitar muara Cisadane. Oleh karena itu dilakukan pemodelan komputasi transpor sedimen di sekitar muara Cisadane selama kurun waktu 1 tahun (Agustus 2020-Juli 2021). Pemodelan ini menggunakan software MIKE-21 module MIKE21/3 Integrated Models yang menggabungkan model hidrodinamika dan transpor sedimen kohesif. Berdasarkan hasil pemodelan ini diketahui bahwa terdapat perbedaan pola transpor sedimen di musim barat dan musim timur. Selama 1 tahun, perubahan ketebalan sedimen dasar di sekitar muara S. Cisadane berkisar -0,4-0,7 m dengan rerata 0,086 m. Pola sedimentasi yang sangat dinamis harus mendapatkan perhatian khusus dalam merancang waduk lepas pantai.