scholarly journals ANALYSIS OF SEDIMENTATION IN WONOGIRI RESERVOIR

2016 ◽  
Vol 2 (1) ◽  
pp. 139
Author(s):  
Tri Joko Inti Budi Santosa
Keyword(s):  
Suspended Load ◽  
Water Area ◽  
Measured Data ◽  
Bed Load ◽  
Central Java ◽  
Calculation Results ◽  
Rating Curves ◽  
Total Sediment ◽  
Sheet Erosion ◽  
Echo Sounding

The Wonogiri reservoir which has 730 million cubic meters of total storage, 90 square kilometers of water area, and 1260 square kilometers of catchment area, is located in the Wonogiri Regency, Central Java Province. It was first established in 1981 and began its operation in 1982 with the expectation that it would last for about 100 years. Today (2002) the reservoir has got a serious problem of sedimentation. The sedimentation is so large that it would decrease the capacity storage of the reservoir and would shorten the length of operation. Therefore, it is necessary to predict the sediment that comes into the reservoir. This research would be based on the total sediment calculation of the sedimentation, through some methods, such as echo sounding measured data, land erosion (USLE), the calculation of the sediment in rivers. This research calculates the sediment capacities based on the water flow data and the sediment rating curves in rivers of Keduang, Tirtomoyo, Temon, upstream reach of Bengawan Solo, Alang, and Wuryantoro. The suspended load was calculated based on the sediment rating curves, whereas the bed load was computed as the percentage of the suspended load. The sum of both calculation results would be the total sediment. The calculation result showed that the total sediment which has come into the reservoir is 6.68 million cubic meters per year. As a comparison, the writer noted that the former researcher using echo sounding method done by the Faculty of Geography of the Universitas Gadjah Mada in 1985, it found that the total sediment capacity which came into the reservoir was 6.60 million cubic meters per year or 5.40 mm per year of sheet erosion. The other research using echo sounding method done by JICA in 2000 found that the total sediment which had come into the reservoir was 4.50 million cubic meters per year or 3.50 mm per year of sheet erosion. By knowing the results of calculation of the total sediment, we can learn that different methods provide different results and it is still uncertain which one is true.

scholarly journals Calculation of bed load based on the measured data of suspended load

2010 ◽  
Vol 8 (4) ◽  
pp. 371-384 ◽  
Author(s):  
Chang-Tai Tsai ◽  
Chih-Heng Tsai ◽  
Chun-Hung Weng ◽  
Jinn-Jong Bair ◽  
Ching-Nuo Chen
Keyword(s):  
Suspended Load ◽  
Measured Data ◽  
Bed Load

Numerical Investigation of Local Scour Around Submerged Pipeline in Shoaling Conditions

2018 ◽  
Author(s):  
Ming-ming Liu ◽  
Ming Zhao ◽  
Lin Lu
Keyword(s):  
Water Waves ◽  
Slope Angle ◽  
Suspended Load ◽  
Local Scour ◽  
Navier Stokes ◽  
Bed Load ◽  
Scour Depth ◽  
Two Dimensional ◽  
Sediment Mass ◽  
Subsea Pipelines

Water waves play an important role in local scour around subsea pipelines laid on the sandy seabed, especially in shallow water regions. In this paper, a two-dimensional numerical model is employed to predict local scour around submarine pipelines under water waves in shoaling condition. The motion of water under waves is simulated by solving the Reynolds Averaged Navier-Stokes (RANS) equations. The evolution of the seabed surface near the pipeline is predicted by solving the conservation of the sediment mass, which transport in the water in the forms of bed load and suspended load. The main aim of this study is to investigate the effect of the seabed slope on the scour profiles and scour depth. To achieve this aim, numerical simulations of scour around a pipeline on a flat seabed and on a slope seabed with a slope angle of 15° are conducted for various wave conditions.

scholarly journals Regression analysis between sediment transport rates and stream discharge for the Nestos River, Greece

2013 ◽  
Vol 14 (3) ◽  
pp. 362-370
Keyword(s):  
Sediment Transport ◽  
Suspended Load ◽  
Bed Load ◽  
Regression Curve ◽  
Degree Polynomial ◽  
Stream Discharge ◽  
Nestos River ◽  
Polynomial Curve ◽  
Load Transport ◽  
Bed Load Transport

Systematic measurements of sediment transport rates and water discharge were conducted in the Nestos River (Greece), at a place located between the outlet of Nestos River basin and the river delta. This basin area is about 838 km2 and lies downstream of the Platanovrysi Dam. Separate measurements of bed load transport and suspended load transport were performed at certain cross sections of the Nestos River. In this study, relationships between sediment transport rates and stream discharge for the Nestos River are presented. A nonlinear regression curve (4th degree polynomial curve; r2 equals 0.62) between bed load transport rates and stream discharge, on the basis of 63 measurements, was developed. In addition, a nonlinear regression curve (5th degree polynomial curve; r2 equals 0.95) between suspended load transport rates and stream discharge, on the basis of 65 measurements, was developed. The relatively high r2 values indicate that both bed load transport rates and, especially, suspended load transport rates can be predicted as a function of the stream discharge in the Nestos River. However, the reliability of the regression equations would have been higher if more measured data were available.

scholarly journals ANALISIS SEDIMENTASI PADA BENDUNG BERINGEN SILA DESA STOWE BERANG KECAMATAN UTAN KABUPATEN SUMBAWA

2018 ◽  
Author(s):  
Badaruddin ◽  
Tri Satriawansyah ◽  
Faturrahman
Keyword(s):  
Economic Cooperation ◽  
Suspended Load ◽  
Bed Load

Bendung Beringin Sila merupakan salah satu bendung yang dibangun dengan biaya bantuan dari luar negeri yaitu Overseas Economic Cooperation Fund (OECF) – Jepang, yang berlokasi di desa Stowe Brang Kecamatan Utan Kabupaten Sumbawa yang digunakan sebagai sarana irigasi untuk mengairi areal persawahan seluas 2.400 ha. Melihat kondisi saat ini, Bendung Beringin Sila mengalami penumpukan sedimen di hulu bendung yang menutupi mercu bendung, bahkan saat banjir sekalipun sedimen dapat terlihat. Tujuan penelitian ini untuk mengetahui besarnya sedimentasi tahunan serta mengetahui besar perbandingan sedimen dasar (Bed Load) dengan sedimen melayang (Suspended Load).Untuk menghitung besar debit aliran sungai pada Sub Daerah Aliran Sungai (DAS), digunakan persamaan dasar manning yang pengaruhi oleh data curah hujan dari satu stasiun selama 5 tahun terakhir. Kemudian diuji menggunakan metode Log Person Tipe III. Serta menghitung curah hujan dan debit banjir.Besarnya sedimentasi permukaan pada Sub Daerah Aliran Sungai (DAS) Utan, digunakan persamaan dasar yang dikenal dengan rumus Schoklitsch dan Forchemeir digunakan untuk menganalisa Sedimen Dasar (Bed Load) dan Sedimen Melayang (Suspended Load) yang masuk ke Bendung Beringin Sila.Berdasarkan hasil analisa diperoleh besar Sedimen Dasar (QSD) pada saat debit normal sebesar 635712,105 ton/tahun, dan Sedimen Melayang (QSM) sebesar 1052356,320 ton/tahun, sedangkan pada saat banjir maksimum (Qr) Sedimen Dasar (Bed Load) sebesar 635712,105 ton/tahun dan Sedimen Melayang (Suspended Load) sebesar 4001918,400 ton/tahun.

scholarly journals Analisa Angkutan Sedimen Pada Hulu Bendung Aepodu Kabupaten Konawe Selatan

2021 ◽  
Vol 2 (1) ◽  
pp. 1-7
Author(s):  
Ramadhan Hidayat Putra ◽  
Amad Syarif Syukri ◽  
Catrin Sudarjat ◽  
Vickky Anggara Ilham
Keyword(s):  
Sediment Transport ◽  
River Flow ◽  
Suspended Load ◽  
Bedload Transport ◽  
Bed Load ◽  
Average Flow ◽  
Load Transport ◽  
Bed Load Transport ◽  
Transport Analysis

Research on Aepodu Weir Sediment Transport Analysis in South Konawe District, based on observations in the field, Aepodu Weir hasa sediment buildup that has now exceeded the height of the weirlight house. The purpose of the study was to analyze the magnitudeof Aepodu river flow and to analyze the amount of sedimenttransport that occurred in the Aepodu dam. The method used todetermine the amount of bed load transport uses stchoklitscht, whilefor transporting suspended load using forcheimer.The results of the analysis of the average flow of the Aepodu riverwere 3,604 m3/ second. Sediment transport that occurs in Aepoduweir is Bedload transport (Qb) of 291625.771 tons / year, andsuspended load transport (Qs) of 16972,423 tons / year, so that thetotal sediment transport (QT) is 308598,194 tons / year.

scholarly journals Wave Loads Computation for Offshore Floating Hose Based on Partially Immersed Cylinder Model of Improved Morison Formula

2015 ◽  
Vol 8 (1) ◽  
pp. 130-137 ◽  
Author(s):  
Shi-fu Zhang ◽  
Chang Chen ◽  
Qi-xin Zhang ◽  
Dong-mei Zhang ◽  
Fan Zhang
Keyword(s):  
Mechanical Characteristics ◽  
Water Area ◽  
Wave Loads ◽  
Wave Load ◽  
Mechanic Analysis ◽  
Morison Equation ◽  
Offshore Pipeline ◽  
Cylinder Model ◽  
Calculation Results

Aimed at wave load computation of floating hose, the paper analyzes the morphologic and mechanical characteristics of offshore hose by establishing the partially immersed cylender model, and points out that the results of existing Morison equation to calculate the wave loads of floating hose is not precise enough. Consequently, the improved Morison equation has been put forward based on its principle. Classical series offshore pipeline has been taken as example which applied in the water area of different depth. The wave loads of pipeline by using the improved Morison equation and compared the calculation results with the existing Morison equation. Calculations for wave loads on pipelines in different depth were accomplished and compared by the improved Morison equation and the existing Morison equation. Results show that the improved Morison equation optimizes the accuracy of the computation of wave load on floating hose. Thus it is more suitable for analyzing the effects of wave loads on floating hose and useful for mechanic analysis of offshore pipeline.

scholarly journals CALCULATION OF THE RATE OF NET ON-OFFSHORE SEDIMENT TRANSPORT ON THE BASIS OF FLUX CONCEPT

1984 ◽  
Vol 1 (19) ◽  
pp. 91 ◽  
Author(s):  
Ichiro Deguchi ◽  
Toru Sawaragi
Keyword(s):  
Sediment Transport ◽  
Water Depth ◽  
Sediment Concentration ◽  
Suspended Load ◽  
Spatial Variations ◽  
Sediment Flux ◽  
Bed Load ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Two Dimensional Model

Time and spatial variations of sediment concentration of both bed load and suspended load in the process of two-dimensional beach deformation were investigated experimentally. At the same time, the relation between the velocities of water-particle and sediment migration was analyzed theoretically. By using those results,a net rate of on-offshore sediment_ transport in the process of two-dimensional model beach deformation qf was calculated on the basis of sediment flux. It is found that Qf coincides fairly well with .the net rate of on-offshore sediment transport calculated from the change of water depth.

The ratio of mechanical to chemical denudation in alluvial systems, derived from geochemical mass balance

1993 ◽  
Vol 84 (1) ◽  
pp. 73-78 ◽  
Author(s):  
A. D. Stewart
Keyword(s):  
Mass Balance ◽  
Chemical Weathering ◽  
Amazon Basin ◽  
Source Area ◽  
Large River ◽  
Suspended Load ◽  
Bed Load ◽  
Load Transport ◽  
Bed Load Transport ◽  
Dissolved Load

ABSTRACTMass balance equations are derived which link the ratios Ts/ (suspended load/dissolved load from chemical weathering) and Tb/Ts (bed load/suspended load), with any two geochemical components present in the source rock and the alluvial system. If the dissolved load is unknown the ratios can be estimated from the relatively insoluble silica and alumina. The ratio Ts/, which for large river basins depends on climate and relief, can thus potentially be determined from ancient alluvial sequences.The equations help define the source composition of a group of 13 modern rivers for which Ts, and alluvial geochemistry are known. These rivers together drain 27% of the continental surface. For a source area with the average continental sandstone to shale ratio of 0·6 the observed average value of Ts/ is obtained when limestone, sandstone and shale are present in the proportions 6·7:21·6:35·7. The figure of 64% sediment in the source area is very similar to the 66% determined by Blatt and Jones (1975) from geological maps of the continents. The equations also show that average bed load transport rate into these 13 basins is about 27% of total transport, and into the Amazon basin about 37%. Bed load transport rates out of the basins, into the sea, are relatively very small.

scholarly journals The choice of soil models in the design of deep excavation in soft soils of Viet Nam

2018 ◽  
Vol 251 ◽  
pp. 04033
Author(s):  
Van-Hoa Nguyen ◽  
Nadezhda Nikiforova
Keyword(s):  
Computational Model ◽  
Measured Data ◽  
Diaphragm Wall ◽  
Viet Nam ◽  
Deep Excavation ◽  
Underground Construction ◽  
Soft Soils ◽  
Calculation Results

The use of diaphragm wall to protect the depth excavation is quite common in Viet Nam. Prediction of diaphragm wall deformations is required to choose the method of construction, and also for control of process of erection of an underground construction. Currently, there are many programs to calculate the deformation of the diaphragm wall, including software Plaxis. This paper considers the choice of a computational model for soils in the Hanoi - Viet Nam region of Mohr Coulomb (MC) and Hardening Soil (HS) and comparison of the calculation results with the measured data. Such investigations were conducted first.

Sign in / Sign up

Export Citation Format

Share Document