Uniform Water Flows within Rectangular Open Channels of Composite Roughness

2012 ◽  
Vol 2 (2) ◽  
pp. 137-139
Author(s):  
Demetriou J Demetriou J ◽  
◽  
Retsinis E Retsinis E
Keyword(s):  
Open Channels ◽  
Water Flows

scholarly journals ANALISIS DEBIT AIR DENGAN VARIASI BENTUK OPEN CHANNEL DENGAN PENAMPANG SEGITIGA, PERSEGI, DAN TRAPESIUM PADA SUATU ALIRAN

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Kun Suharno ◽  
Catur Pramono ◽  
Sigit Mujiarto ◽  
Kurniawan Setyo Anggoro
Keyword(s):  
Water Surface ◽  
Open Channel ◽  
Free Water ◽  
Open Channels ◽  
Test Results ◽  
Angle Variation ◽  
Water Flows ◽  
Channel Parameters ◽  
Valve Angle ◽  
Rectangular Notch

An open channel is a channel where water flows with free water. In open channels, such as rivers (natural channels), channel parameters are very irregular. Damming the channel is a transition that serves to determine the height of the water surface along the channel, on this issue the author examines how water flows when through open channel with v-notch, rectangular and trapezoidal shapes in a stream. Based on the test results on 35° valve angle variations, the increase debit from the v-notch debit leads to a rectangular-notch debit of 23.63% and the largest decrease in debit from the rectangular notch to trapezodial-notch is 48.38%. In the valve angle variation 40°, the largest increase in debit between the v-notch discharge towards a rectangular-notch discharge of 18.64% and the decrease in the largest debit from rectangular-notch to trapezodial-notch at 45.31%. In the valve angle variation 45° the largest increase debit between the v-notch debit towards a rectangular-notch debit is 18.64% and the largest decrease debit from the rectangular notch to trapezodial-notch debit is 46.15%.

scholarly journals The influence of weight coefficients in the Preissman scheme on flows in the lower Odra river network using the Hec-Ras software

2018 ◽  
Vol 23 ◽  
pp. 00024
Author(s):  
Robert Mańko
Keyword(s):  
River Network ◽  
Main Flow ◽  
Open Channels ◽  
Channel Axis ◽  
One Dimensional ◽  
Water Flows ◽  
Odra River ◽  
Saint Venant Equations ◽  
The Impact ◽  
Weight Coefficients

Mathematical modelling of water flows processes in rivers and open channels for many years has been target of researches for hydrotechnics and hydrologists. For flows forecasting in open channels models based on one-dimensional equations are mostly used. This models are assuming that the main flow component is parallel to the channel axis is substantially larger than others, so it can ignore them. One of the most effective methods for solving de Saint-Venant equations is the finite difference method with using four-point Preissman Scheme. In this paper an analysis of the impact of Preissman weighting parameters on flows in the lower Odra river network.

scholarly journals An Extended Mathematical Model for Shallow Water Flows in Vegetated Open Channels

2014 ◽  
Vol 20 (1) ◽  
pp. 29-35
Author(s):  
Hidekazu Yoshioka ◽  
Ayaka Wakazono ◽  
Nobuhiko Kinjo ◽  
Koichi Unami ◽  
Masayuki Fujihara
Keyword(s):  
Mathematical Model ◽  
Shallow Water ◽  
Open Channels ◽  
Water Flows ◽  
Shallow Water Flows ◽  
Vegetated Open Channels

Implementation Color-Images Cryptography Using RSA Algorithm

2017 ◽  
Vol 7 (11) ◽  
pp. 181
Author(s):  
Ali Saleh Al Najjar
Keyword(s):  
Information Security ◽  
Image Encryption ◽  
Color Images ◽  
Public Key ◽  
Open Channels ◽  
Image Security ◽  
Rsa Algorithm ◽  
The Media ◽  
Encrypted Images ◽  
Difficult Issue

Absolute protection is a difficult issue to maintain the confidentiality of images through their transmission over open channels such as internet or networks and is a major concern in the media, so image Cryptography becomes an area of attraction and interest of research in the field of information security. The paper will offer proposed system that provides a special kinds of image Encryption image security, Cryptography using RSA algorithm for encrypted images by HEX function to extract HEX Code and using RSA public key algorithm, to generate cipher image text. This approach provides high security and it will be suitable for secured transmission of images over the networks or Internet.

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