scholarly journals Konversi Tinggi Pasang Surut Di Perairan Cilacap Terhadap Energi Yang Dihasilkan

2015 ◽  
Vol 18 (2) ◽  
Author(s):  
Gentur Handoyo ◽  
Agus A.D Suryoputro ◽  
Ibnu Pratikyo
Keyword(s):  
Water Level ◽  
Tidal Energy ◽  
High Water ◽  
Factors Affecting ◽  
High Water Level ◽  
Central Java ◽  
The Future ◽  
The Face ◽  
One Year ◽  
Central Java Province

Pasang surut merupakan parameter yang penting dalam memperoleh besaran energi pasang surut yang berdasarkan nilai muka air pasang tertinggi dan surut terendah. Perairan Kabupaten Cilacap, propinsi Jawa Tengah merupakan perairan yang terletak di Samudera Hindia yang diduga terdapat potensi energi pasang surut yang tinggi. Selain itu faktor lokal yang mempengaruhi adalah bentuk morfologi pantai yang berbentuk alamiah dan diperairan pantai seperti teluk dan selat sempit serta kedalaman perairan. Tipe pasang surut dan nilai muka air pasang tertinggi dan muka air surut terendah diperoleh menggunakan Metode Admiralty. Hasil yang didapt tipe pasang surut di perairan Kabupaten Cilacap Campuran Condong ke Harian Ganda dengan nilai formzahl 0,3. Sedangkan nilai muka air pasang tertinggi sebesar 2,3m dan surut terendah sebesar 0,05m. Hasil simulasi untuk luasan kolam tunggal 1,1 km2 diperoleh energi pasang surut sebesar 61.161 kWh selama kurun waktu satu tahun di perairan Kabupaten Cilacap, Propinsi Jawa Tengah. Maka dapat disimpulkan, bahwa pemanfaatan perencanaan kedepannya untuk memperoleh energi pasang surut yang maksimal sebagai sumber energi alternatif.Kata kunci : Energi, Pasang Surut, Perairan CilacapTidal is an important parameter in obtaining tidal energy quantities are based on the face value of the highest high water level and the lowest low water level. Cilacap Regency waters, Central Java province is located in the waters of the Indian Ocean which is allegedly contained the high potential tidal energy. Tidal are caused by the influece of the force attraction of the moon and the sun. Besides that the local factors affecting is the shaped of morphology coastal which is natural-shaped and in coastal waters such as gulf, narrow strait and the waters depth. The type and tidal value of the highest high water level and the lowest low water level is obtained by using admiralty methods, the results obtained in the tidal type Cilacap Regency waters mixed tide prevailing semi diurnal is formhazl value 0,3. While the face value of the highest high water level is 2,3 m and the lowest low water level is 0,05 m. Simulation results for expressing a single pool of 1,1 km2 of tidal ebergy acquired 61.161 kWh for one year in the waters of Cilacap Regency, Central Java province. Thus it can be inferred that the utilization of energy obtained can be refference in the future construction planning in the future to obtain the maximum tidal energy as a source alternative energy.Keywords : Energy, Tidal, Waters of Cilacap 

scholarly journals Inundation due to the tide in the context of sea level rise and the role of Can-Gio forest in the reduction of inundation

2018 ◽  
Vol 20 (K7) ◽  
pp. 76-85
Author(s):  
Hoa Thi Le ◽  
Hoa Tang My Son ◽  
Hong Thi My Tran ◽  
Giang Song Le
Keyword(s):  
Sea Level Rise ◽  
Water Level ◽  
Sea Level ◽  
High Tide ◽  
High Water ◽  
High Water Level ◽  
Maximum Water Level ◽  
Level Increase ◽  
The Future ◽  
Calculation Results

Lower basin of Sai Gon – Dong Nai river is lowland. It’s inundated at high tide. Using mathematical model method with the integrated 1D2D model, the inundation hazard due to the high tide in this region has been evaluated through the inundated area. The calculation results also showed that in the case when the damping ability of Can Gio forest is disabled high water level at Nha Be and Phu An can be increased about 2 – 3 cm and the effect will be stronger in the future following the sea level rise. In the case the Can Gio forest is diked to create a reservoir with reasonable in- and outflow directions, the high water level at Nha Be and Phu An can be decreased about 10 - 11 cm and the effect will be stronger in the future following the sea level rise. This water level decrease effect almost compensates the water level increase due to the sea level rise and keeps the maximum water level at Phu An not exceed actual one until 2050 regardless the sea level rise.

Numerical Simulation of Engineering Wave for Zhongzui Bay

2007 ◽  
Author(s):  
Xiejun Shu ◽  
Senhui Jiang ◽  
Ruijie Li
Keyword(s):  
Numerical Simulation ◽  
Water Level ◽  
Simulation Method ◽  
High Water ◽  
Wave Transformation ◽  
Return Periods ◽  
Engineering Construction ◽  
Wave Refraction ◽  
High Water Level ◽  
Mild Slope Equation

For providing a better shelter condition, it is necessary to build a breakwater in Zhongzui Bay. In order to know whether mooring area meets the requirement after engineering construction and compare the mooring area between solid breakwater and permeable breakwater, a numerical simulation method is used in the sheltering harbor of Zhongzui Bay. The used Mild-slope equation which describes wave refraction, diffraction and reflection, considers the steep slope bottom and effect of energy dissipation. It has been validated to fit for simulating wave transformation in the coastal zone. Under extreme high water level and design high water level, wave fields in the calculation area of three wave types in three different return periods are simulated by using this method respectively. In addition, wave height in front of breakwater can be provided. Then the wave parameters and the mooring area of two occasions, with and without breakwater, are gained in calculation area. Based on these results, some conclusions are presented in the end.

scholarly journals The influence of Three Gorges Reservoir high water level on the rainfall runoff

2018 ◽  
Vol 246 ◽  
pp. 01007
Author(s):  
Biqiong Wu ◽  
Wei Zheng ◽  
Xinkai Ren ◽  
Tao Xu ◽  
Xiao Guo
Keyword(s):  
Water Level ◽  
Three Gorges Reservoir ◽  
Reference Value ◽  
High Water ◽  
Three Gorges ◽  
Rainfall Runoff ◽  
Flood Peak ◽  
High Water Level ◽  
Three Gorges Region ◽  
Unit Hydrographs

After Three Gorges Reservoir building up, the natural river course and the near hillside inside the backwater region are inundated to form a fairly wide man-made lake which affects the hydrological characteristics and floodwater transmission to different degrees. When the reservoir impound to high water level, the conflux time is obviously shortened, the flood-peak discharge increase, and the peak type became sharper. The change of runoff yield and concentration makes the forecast scheme unable to be applied well. Based on the practice of Three Gorges Reservoir operation, the rainfall-runoff characteristics of the backwater region under the condition of high water level are analysed and summarized, then a set of unit hydrographs suitable for rainfall-runoff calculation are recalibrated, which has great reference value for hydrological forecasting of Three Gorges region.

Stromatolites from the Middle Old Red Sandstone of Western Orkney

1969 ◽  
Vol 106 (1) ◽  
pp. 77-88 ◽  
Author(s):  
N. G. T. Fannin
Keyword(s):  
Water Level ◽  
Algal Bloom ◽  
Granite Gneiss ◽  
High Water ◽  
Red Sandstone ◽  
High Water Level ◽  
Show Evidence

SUMMARYThe structures are comparable with stromatolites seen in modern “flats” environments and tufa occurring in joints in the granite—gneiss basement is compared with modern and fossil forms. Finely laminated (? varved) carbonates with a large lateral persistency (1: 50,000) are referred to periods of high water level and are believed to show evidence of seasonal algal bloom. The presence of widespread stromatolite structures is consistent with earlier environmental interpretations of the Orkney rocks.

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