scholarly journals The seepage flow analysis of main dam stability in Way Sekampung dam development project

2021 ◽  
Vol 1 (1) ◽  
pp. 1-12
Author(s):  
Tommy Andreant ◽  
Lusmeilia Afriani ◽  
Ofik Taufik Purwadi ◽  
Andius D. Saputra
Keyword(s):  
Water Level ◽  
Flow Analysis ◽  
Seepage Flow ◽  
Flow Speed ◽  
Development Project ◽  
Filtration Flow ◽  
Average Value ◽  
Seismic Coefficient ◽  
Dam Stability ◽  
Slice Method

Analysis using depression line method was conducted in two conditions, at normal water level (± 124 m) with a result of 1.11 × 10-3 m3/s and at flood water level ± 126.5 m with result 1.33 × 10-3 m3/s. Capacity shows (< 1%) the average enters the reservoir, making it safe from the danger of distress. Safety calculations for pipping showed a bigger value than the filtration flow speed indication at the average value of 4,638 ( > 4) which means that dam will not make pipping symptoms. Analysis conducted on the slope of the dam using slice method without entering the value of seismic coefficient obtained a safe number result in all loading conditions and the analysis by adding a seismic coefficient get a safe result except in two conditions, at elevation ± 126.5 m is  SF 1.05 and at elevation ± 124 m SF is 1.05.

scholarly journals KAJIAN ASPEK FISIKA, KIMIA, DAN BIOLOGI PERAIRAN SITU RAWABEBEK, KARAWANG, DALAM RANGKA PENGELOLAAN PERIKANAN BERBASIS BUDI DAYA

2016 ◽  
Vol 1 (1) ◽  
pp. 115
Author(s):  
Bambang Gunadi ◽  
Supriyono Eko Wardoyo
Keyword(s):  
Water Level ◽  
Diversity Index ◽  
Gonadosomatic Index ◽  
Stable Condition ◽  
Aquatic Organism ◽  
Wiener Index ◽  
Quality Parameters ◽  
Average Value ◽  
Physical Chemical ◽  
Biological Aspects

Penelitian tentang aspek-aspek fisika, kimia, dan biologi perairan bekas galian pasir telah dilakukan di Situ Rawabebek Kabupaten Karawang. Tujuan penelitian adalah untuk mendapatkan data dasar bagi penyusunan model pengelolaan perikanan di perairan bekas galian pasir berdasarkan prinsip perikanan berbasis budi daya (culture-based fisheries, CBF). Hasil pengamatan menunjukkan bahwa fluktuasi air di Situ Rawabebek mencapai hingga 1,90 m dan sangat dipengaruhi oleh ketinggian air Sungai Citarum. Nilai semua parameter kualitas air berada dalam kisaran yang layak untuk mendukung kehidupan ikan sementara kadar logam berat berada dalam ambang aman untuk kehidupan organisme akuatik termasuk ikan dan kesehatan manusia. Indeks keragaman plankton (Indeks Shanon-Wiener) pada setiap stasiun dan musim pengamatan berkisar antara 3,95—4,52 yang berarti bahwa komunitas plankton di Situ Rawabebek stabil dan perairannya dalam kondisi belum tercemar. Jenis ikan yang teramati untuk mengetahui pola reproduksinya di Situ Rawabebek antara lain lalawak (Puntius bramoides), paray (Rasbora argyrotaenia), dan seren (Cyclocheilichthys apogon) dengan tingkat Indeks Kematangan Gonad (IKG) masing-masing 3,43%; 12,82%; dan 3,95%. Dari analisis terhadap kondisi fisika, kimia, dan biologinya disimpulkan bahwa perairan bekas galian pasir Situ Rawabebek cukup layak untuk pengembangan perikanan berbasis budi daya.A study on the physical, chemical, and biological aspects of the abandoned sand mining reservoir was conducted in Rawabebek Reservoir (Karawang Regency, West Java). This study aimed to develop a model of fisheries management in the reservoir based on the culture based fisheries (CBF) system. The study showed that the fluctuation of water level in the Rawabebek Reservoir was monitored up to 1.90 m and highly influenced by the water level of Citarum River. The average value of all water quality parameters and heavy metals were in the suitable range for aquatic organism, fish and human health. The diversity index of plankton (Shanon-Wiener Index) at each station and sampling time observed, were ranged between 3.95 to 4.52 implied that the plankton community in the Rawabebek Reservoir was in the stable condition with no water pollution. Three fish species were observed for reproduction pattern in the Rawabebek Reservoir namely lalawak (Puntius bramoides), paray (Rasbora argyrotaenia), and seren (Cyclocheilichthys apogon) with the Gonadosomatic Index (GSI) were 3.43%, 12.82%, and 3.95%, respectively. Due to those physical, chemical and biological aspects, it was concluded that Rawabebek Reservoir was suitable for culture based fisheries (CBF) management system.

Study on the Capacity Increasing and Dam Heighten of Plain Reservoirs

2013 ◽  
Vol 353-356 ◽  
pp. 2531-2536
Author(s):  
Xiu Guang Song ◽  
Zhi Dong Zhou ◽  
Hong Bo Zhang ◽  
Hong Ya Yue
Keyword(s):  
Numerical Simulation ◽  
Comparative Analysis ◽  
Site Investigation ◽  
Seepage Flow ◽  
Differential Settlement ◽  
Construction Technology ◽  
Dam Stability ◽  
The Stability ◽  
Design Construction

In order to solve the problem of differential settlement, seepage flow and stability between the new and old dam boundary in capacity increasing of the plain reservoirs, the comparative analysis on the stability of the dam slope with different methods on dealing with the new and old dam boundary was performed by numerical simulation with FLAC3D. The result shows that combining the new and old dam by using geogrid indicates superiority for reducing differential settlement, improving the dam stability and safety, etc. In the meantime, on the basis of actual site investigation and theoretical analysis, combined with the requirements of design, construction and management in capacity increasing of the plain reservoirs, the key construction technology was put forward and widely applied foreground, which can improve the quality of the construction, reduce engineering disease and provide references for capacity increasing engineering of in plain reservoirs.

Three-Dimensional Numerical Analysis of Tunnel Seepage Based on the Iteration Method

2012 ◽  
Vol 479-481 ◽  
pp. 2441-2445
Author(s):  
Fu Sheng Liu ◽  
Guo Yuan Xu ◽  
Sheng Bin Hu ◽  
Wen Tong Huang ◽  
Min Hu
Keyword(s):  
Ground Water ◽  
Water Level ◽  
Iteration Method ◽  
Water Discharge ◽  
Seepage Flow ◽  
Economic Benefits ◽  
Ground Water Level ◽  
Engineering Practice ◽  
The Impact ◽  
Saturated Surface

The groundwater can cause a significant threat to the safety of the tunnels excavated in water-rich areas. To investigate the impact of seepage to tunnels, the most important issues are calculations of the saturated surface and seepage flow. According to the great similarity between temperature field and seepage field in the theoretical foundation, differential equations and boundary conditions, the thermal analysis function of ANSYS could be used to calculate the non-pressure stable seepage based on the iteration method. The saturated surface and seepage flow through the lining are obtained by take a tunnel as an example, under using iteration method programming in ANSYS software. Additionally, on the basis of the correlation analysis, with the reduction of ground water level, the seepage discharge through the lining decreased sharply at the beginning, and then, the reduction trend gets inconspicuous. It has no obvious effect to decrease the water discharge by reducing the ground water level under this condition. Therefore, taking economic benefits into account, it is unadvisable to lower water level blindly. The optimal analysis of the actual conditions should be carried out in engineering practice. It has a certain reference value to the design and construction of tunnels in water-rich areas.

scholarly journals Mechanism of Seepage Flow Due to Water Level Variation in a River Entrance

2012 ◽  
Vol 68 (2) ◽  
pp. I_1096-I_1100
Author(s):  
Katsuaki KOMAI ◽  
Kiyoshi KAWANISHI ◽  
Mahdi RAZAZ ◽  
Kazuki KOKUBO ◽  
Satoshi WATANABE ◽  
...  
Keyword(s):  
Water Level ◽  
Seepage Flow ◽  
Level Variation ◽  
Water Level Variation

scholarly journals Pengaruh ketinggian air dalam pemeliharaan larva ikan hias botia (Chromobotia macracanthus, Bleeker)

2014 ◽  
Vol 1 (1) ◽  
pp. 24 ◽  
Author(s):  
Maulina Sari ◽  
Muhammad Hatta ◽  
Asep Permana
Keyword(s):  
Weight Gain ◽  
Survival Rate ◽  
Water Level ◽  
Fish Larvae ◽  
Quality Parameters ◽  
Water Levels ◽  
Average Weight ◽  
Larval Rearing ◽  
Growth And Survival ◽  
Average Value

Penelitian ini bertujuan untuk mengetahui pengaruh ketinggian air yang berbeda terhadap pertumbuhan dan kelangsungan hidup larva ikan botia (Chromobotia macracanthus, Bleeker). Hasil penelitian menunjukkan bahwa sintasan atau kelangsungan hidup tertinggi terdapat pada perlakuan B dengan ketinggian air 10 cm yaitu sebesar 98.88%, sedangkan kelangsungan hidup terendah terdapat pada perlakuan A dengan ketinggian air 5 cm yaitu sebesar 97.99%. Pertambahan bobot nilai tertinggi terjadi pada perlakuan A dengan ketinggian air 5 cm dengan nilai bobot rata–rata 0.02252 gr dan pertambahan bobot rata–rata terendah terjadi pada perlakuan C dengan ketinggian air 15 cm yaitu sebesar 0.01132 gr. Pertambahan panjang rata–rata tertinggi terjadi pada perlakuan A yaitu sebesar 0.42 cm dan yang terendah terjadi pada perlakuan B yaitu sebesar 0.29 cm. Parameter kualitas air selama penelitian masih dalam kisaran optimal dimana suhu 24,3–28,9oC, pH 6,5–7,0, DO 6,84–7,69 ppm, NH3 0,00–0,03 ppm, NO2 0,00–0,07 ppm. Analisis statistik dengan uji F diperoleh bahwa ketinggian air yang berbeda dalam pemeliharaan larva ikan botia (C. macracanthus, Bleeker) berbeda sangat nyata (P>0.01) terhadap pertambahan bobot dengan nilai Fhitung (21.00) > Ftabel (10.92), dan berbeda sangat nyata terhadap pertambahan panjang dengan nilai Fhitung (23.56) > Ftabel (10.92), sedangkan untuk sintasan atau kelangsungan hidup tidak berbeda nyata antar perlakuan. Hasil uji BNT menunjukkan, setiap perlakuan memberikan pengaruh terhadap pertumbuhan dan tidak berpengaruh terhadap kelangsungan hidup.The study aims to determine the effect of different water levels on the growth and survival of fish larvae Botia (Chromobotia macracanthus, Bleeker). The results showed that the survival rate was highest in treatment B with the water level was 10 cm which was equal to 98.88 %, whereas the lowest survival rate was found in treatment A with the water level was 5 cm which was equal to 97.99 %. The highest value of weight gain occurred in treatment A with average value in weight was 0.02252 g and the average weight gain was lowest in the treatment of C that reached 0.01132 g. The highest growth of length was occured in treatment A that was equal to 0.42 cm and the lowest occurred in treatment B that was 0.29 cm. Water quality parameters during the study were in the tolerance range where the optimum temperature were 24,3-28,9 oC , pH 6.5 to 7.0, DO 6.84 to 7.69 ppm, NH3 0.00 to 0.03 ppm , NO2 0.00 to 0.07 ppm . Statistical analysis by F test showed that the different water levels in the larval rearing of fish Botia (C. macracanthus, Bleeker) was significantly different ( P > 0.01) in the weight gain with the value of Fcount ( 21.00 ) > Ftable ( 10.92 ), and it was significantly different against the length with the value of F count ( 23:56 ) > F table ( 10.92), while for the survival rate showed has not significantly different between treatments. The LSD test showed that all the treatment were effected the growth rate, but not for survival rate.

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