The flight test of N219 Amphibious aircraft will be targeted in 2003/2024. For flight tests, these aircraft need a seaplane dock. One of the potential locations for the seaplane dock is Panjang Island at Seribu Islands. This study aims to know the characteristic of hydrodynamic and wave conditions and to determine whether Panjang Island is suitable for the seaplane dock. This study uses a modeling method with MIKE 21 FM HD-SW module and MIKE 21 Boussinesq Wave (BW)  module. The bathymetry data were obtained from the Indonesian Navy Hydrographic and Oceanographic Center (Pushidrosal), tide data is generated from Tide Model Driver (TMD), wave and wind data from ECMWF. The result of surface elevation validation between hydrodynamic modeling and TMD is 92%. During the west monsoon and spring conditions, the difference in the largest and lowest current velocity is quite large (0.018-0.199 m/s), on the other hand, when the tides are in neap conditions (0.008-0.144 m/s). Meanwhile, during the east monsoon and spring conditions, the difference in the largest and lowest current velocities is quite large (0.02-0.193 m/s), on the other hand, when the tides are in neap conditions (0.008-0.146 m/s). The maximum wave height resulting from the 50-year return period waveform modeling between 1.139 - 1.474 m. Meanwhile, the significant wave heights between 0.679 - 0.741 with a significant wave period of 13.45 seconds. In general, the current and wave conditions of the two locations are suitable for the construction of the seaplane dock, except that the dominant wave heights are still above the requirements.

This research aims to assess the hydrodynamics condition of the water area for site selection of that purpose. The bathymetry data of Karimunjawa Island were obtained from the 1986 Pushidrosal bathymetric map. Furthermore, wind direction, wind speed, wave height and direction, and tidal data around the waters of Karimunjawa Island were input in hydrodynamic and spectral modelling using MIKE 21 HD-SW. West monsoon and east monsoon were applied in this model. The validation result between hydrodynamic modelling and Tidal Model Driver (TMD) data is 98.89%. The surface elevation around the domain has a range of 0.072 - 0.5 m. The average water depth at the seaplane dock plan is about 2.5 m from MSL. The hydrodynamic modeling results show that the surface elevation value at the seaplane dock plan location shows that the sea level is between -0.467 to 0.473 m (in both west and east season). The current velocity at the planned seaplane dock site in both the west and east monsoons is relatively slow (<0.185 m/s). The dominant wave direction is southeastward in the east and west monsoons. The dominant Hs is about 0.23 – 0.6 m in both seasons. At the planned water operating area, the average of Hs is 0.23 m - 0.36 m. Generally, this location fulfills the criteria of site selection for the flight test location of N219A.

No abstract

Water is one of the factors which is very important and necessary in the life of living creatures. Therefore, water must be available whenever and wherever in the quantity, timing, and sufficient quality. Hydraulic ram pump (Hydram) is a pump which does not require external energy as the power source. The purposes of this research are to understand the influence of input pipe angle on the output generated volumetric rate and efficiency. This research used a hydrant pump with a compressor dimension of 3 inch in diameter and 60 cm in height. The input pipe angles varied were 35°, 40°, 45°, 50° and 55°. The water heights were ranging from 1 to 5 meter. The method of analysis was conducted by analyzing the data obtained during the experiments. The results show that the best output volumetric rate is 0.079 l/s with the input pipe angle of 35°a nd the water height of 3 m. The lowest output volumetric rate of 0.01 l/s is obained from the pump with the input pipe angle of 55° and the water height of 5 m. The best efficiency is 6.10% in at the input pipe angle of 35 ° and water height of 3 m. The lowest efficiency is 1.24% at the input pipe angle of 55° and water height of 5 m. PENDAHULUANAir merupakan salah satu faktor yang sangat penting dan dibutuhkan dalam kehidupan makhluk hidup. Selain untuk pengembangan fisiologis makhluk hidup, air juga menjadi input bagi beragam upaya atau kegiatan makhluk hidup dalam rangka menghasilkan sesuatu untuk kelangsungan hidupnya. Munculnya permasalahan yang menyangkut air yang disebabkan oleh peningkatan beragam kebutuhan dan kepentingan kehidupan makhluk hidup, pada gilirannya berdampak terhadap terganggunya kondisi permintaan dan penyediaan air. Beberapa daerah yang letaknya jauh dari sumber air atau berada di atas sumber air tentu akan kesulitan mendapatkan air. Oleh karena itu diperlukan suatu teknologi yang mampu mengangkat air dari tempat yang rendah ke tempat yang

Water is one of the factors which very important and necessary in the life of living creatures. Therefore, water must be available whenever and wherever in the quantity, timing, and sufficient quality. Hydraulic ram pump is a pump which does not require external energy as the power source. The purpose of this research is to understand the influence of the mounting tube compressor with tilt angle from the water weight-lift of output pipe. This research uses hydrant pump with a dimension of the compressor of 3 inches (in diameter) and 60 cm (in height). The falling angle of the pump is 35°. The falling-height is 2 meter with 4 variations of weight-lift 4, 4½, and 5 meters. The method of analysis is conducted by analyzing data obtained in the experiment, while the results are pres ented in the form of tables and graphs. The results of the research shows that the best volumetric rate output is about 0.035 l/s at the mounting tube compressor of 90° and 4 meters water weight-lift, while the lowest volumetric rate output is 0.011 l/s at the 5 meters water weight-lift. The best efficiency is 27.3% at the mounting tube compressor of 90° w i t h 4 meters of water weight-lift, while the lowest efficiency is 6.5 % at the mounting tube compressor of 90° and the 5 meters of water weight-lift.