2020-05-30T13:49:49Z
http://wsej.iauahvaz.ac.ir/?_action=export&rf=summon&issue=115010
Journal of Water Science & Engineering
Journal of Water Science & Engineering
2251-6905
2251-6905
2017
7
16
Geometric simulation and the salinity of water entering to the Hoor al-Azim wetland for determine the capacity of drainage water
Kazem
Hemmadi
Samaneh
Abdoveis
Hoor al-Azim wetland, are a large and permanent wetland area located between Iran and Iraq. By entering the flow to the wetland area, the geometry of the wetland, acts in the form of an inverted imperfect pyramid. So that by entering the water flow, the water level of wetland is simultaneous by increasing the surface. In this study by using the geometric relationships of pyramids, was acted to the geometric simulation of the Quintuple reservoirs. Results have shown that in order to keep wet all or part of these two reservoirs, the safety capacity of about 1.5 billion cubic meters per year equals to 48 cubic meters flow per second is required, which is a mixture of river water and drainage water. Therefore by this 50 percent of mixing, electrical conductivity of water in these tanks will be controlled in about 5500 micro mouse per centimeter.
Hoor al-Azim wetland
Geometric simulation
Salinity of wetland
2017
07
01
7
19
http://wsej.iauahvaz.ac.ir/article_538167_de654f6da37cb4967b6e532ed705fe8f.pdf
Journal of Water Science & Engineering
Journal of Water Science & Engineering
2251-6905
2251-6905
2017
7
16
The use of wavelet-artificial neural network and adaptive neuro-fuzzy inference system models to predict monthly precipitation
Mojtaba
Ebrahimi
Reza
Mohammad Pour
In water supply systems, One of the most important components as safety unit and the current controller (Switching flow and regulate the amount of flow) used in the arrangement of lines of water. In this study, according to multiple ponds in Tanguiyeh dam water pipeline to industrial and mining company Gol Gohar Sirjan Butterfly valve used in these ponds using Fluent software simulation has been the case. Flow characteristics such as speed, pressure and turmoil in the different modes of separation is studied. Current results show that Speed in opening and closing the valve will be rises. In the study of pressure was also observed that by closing valves pressure reduced in the gate valves.
Butterfly valve
Valves gate
Numerical modeling
Model k-ε
Turbulence
2017
07
01
21
32
http://wsej.iauahvaz.ac.ir/article_538168_e37be231a57e38505aa121a55bc24fea.pdf
Journal of Water Science & Engineering
Journal of Water Science & Engineering
2251-6905
2251-6905
2017
7
16
Performance evaluation of groundwater drainage in two types of PP450 synthetic filters and natural filtering in Sugarcane Farms: A Case Study of Salman Farsi Cultivation and Industry
Khosroo
Gharbali
Ali
Asareh
Mehdi
Asadilour
Sand coverings account for a large part of the cost of a project. The purpose of this study is to evaluate the performance of different coatings for filtration of underground drains and reduce the cost of cornfield farms. The experiments were carried out in farm in Salman Farsi. The subsoil drainage was fitted to each test piece with a length of 120 meters, a diameter of 100 mm, and a distance of 30 meters from each other. The experiments were carried out in 3 treatments and 3 replicates in 9 parts. In each treatment, three underground drainage systems were installed and the middle drainage was measured as experimental drainage. Underground drainage treatments were: C treatment: synthetic drainage pipes PP450, treatment D: sand and gravel-bearing drainage pipes and treatment E: uncoated drainage pipes. In each experimental part, two rows of wells were observed at zero, 4 /, 1.5, 15, 30 and 45 meters from the central drainage. Irrigation depth was considered at 25 centimeters. During the experiment, 14 irrigation intervals were performed at a depth of 3.5 meters. It should be noted that the land was irrigated in experimental fields. In order to evaluate the performance of the coatings used for groundwater drainage filtration, the results of lateral discharge (H), resistance to flow (re) and cumulative constants of flow resistance to underground lateral flow (eα) were used. Estimated cost of artificial filter and natural filter was calculated based on irrigation and drainage price list of year 94 and adjusted modalities. The results of the experiment showed that PP450 synthetic filter and sand filter showed good and acceptable results on all parameters related to drainage quality, such as drainage effluent, flow resistance and cumulative constant. The drainage without filtering was not good in any of the desired parameters, and had no acceptable results. Also, the results showed that artificial filters had a 25 percent reduction in costs compared to natural filters; the resulting income also increased by 17 percent due to a decrease in the amount of salinity due to the use of artificial filters in comparison with the natural filter. In other words, the use of PP450 synthetic filters in comparison with the natural filter of sand and mass gives 42% more revenue.
natural filter
synthetic filter
sugar cane
discharge efficiency
resistance to flow
2017
07
01
33
48
http://wsej.iauahvaz.ac.ir/article_538171_7f85b03b4da20beaa66f66abd803b018.pdf
Journal of Water Science & Engineering
Journal of Water Science & Engineering
2251-6905
2251-6905
2017
7
16
Frequency Analysis of Maximum Daily Rainfall in various Climates of Iran
Abbas
Ahmadpour
Hosein
Fathian
Parviz
Haghighatjoo
In this research in order to frequency analysis of maximum daily rainfall in various climates of Iran the data of 40 synoptic rain gauges collected in 40 years period i.e., 1973 to 2012 were used. These stations are located in various climates of Iran according to De Martonne climatic classification. At first, input of data to HYFA package was performed. The mentioned package includes seven probability distribution functions such as normal, two- and three-parameter lognormal, two-parameter gamma, Pearson and log-Pearson type III and extreme value type I or Gumbel. Then the data were fitted to seven mentioned distributions. HYFA estimates the parameters of the distributions by the methods of moments and maximum likelihood. The best distribution for each station was determined using mean relative deviation and mean square relative deviation as goodness of fit tests. The results showed that the suitable distribution for 29 stations is three-parameter lognormal, for five stations is two-parameter gamma, for two stations is two-parameter lognormal, for four stations is extreme value type I or Gumbel. Also, this study shows that the maximum daily rainfall in various climates of Iran can be analyzed with similar probability distribution functions. On the other hand, in similar climates, one could not use the same probability distribution functions for analyzing the data.
Frequency Analysis
Maximum Daily Rainfall
Statistical distributions
climate
2017
07
01
49
60
http://wsej.iauahvaz.ac.ir/article_538172_5ad2bb0286c1f5b3cbd994f41bb06d08.pdf
Journal of Water Science & Engineering
Journal of Water Science & Engineering
2251-6905
2251-6905
2017
7
16
Study of Pedotransfer Functions Multivariate regression, MLP and RBF to estimate CEC for Soils of North Ahvaz
Ali
Salehi
kamran
Mohsenifar
Ali
Gholami
To estimate the Cation Exchange Capacity (CEC), indirect manner used of Pedotransfer Functions (PTFs). CEC is one of the important soil fertility factors, and not measured directly because it is costly and time consuming. Thus, used from regression equations between easily and non-easily soil properties. The purpose of this research, is develop the PTFs for CEC, with use of easily available soil properties. For this purpose, measured for 100 sample of soil contain of 1000 data include soil particle size distribution, bulk density, organic matter, lime, pore space, geometric mean diameter and geometric standard deviation were done. After data normalization, were done PTFs with Multivariate Regression (MR) in SPSS and Artificial Neural Networks (ANNs) for soil CEC in MATLAB software. The ANNs used in research are Multi-Layer Perceptron (MLP) and Radial Basis Function (RBF). Education of ANNs are based on trial and error, until arrived suitable outputs with changes hidden layer number and neuron number. From all data were Selected 70% (700) data for training and 30% (300) for teste. Then were entered all data to software and test different networks with one hidden layer. The network was design with trial and error to maximum correlation coefficient and minimum mean square error (MSE). The results were shows MR is suitable for predict CEC (R2 =0.87) and for MLP network, were shows ANN can good estimated CEC with used of easily soil properties. MLP network able to estimate CEC with 9 neurons in input layer, 7 neurons in hidden layer and 1 neuron in output layer with tangent sigmoid transfer function, Linear transfer function and Bayesian learning algorithm with coefficient correlation 0.97 and MSE 0.013. For RBF networks to estimation CEC coefficient correlation and MSE were 0.55, 0.017 respectively. Results shows the MLP network with 1 hidden layer for estimation CEC with use of soil distribution, bulk density, organic matter and lime, is better than RBF network compared with of MSE and coefficient correlation.
Cation Exchange Capacity
Pedoteransfer function
Multivariate regression
Easily Available Soil Properties
2017
07
01
61
72
http://wsej.iauahvaz.ac.ir/article_538174_6e9431a0a141d4ca1aecb36f38765207.pdf
Journal of Water Science & Engineering
Journal of Water Science & Engineering
2251-6905
2251-6905
2017
7
16
Effect of Outlet Submergence in Bottom Outlet on Aeration between Emergency and Service Gates at high Dams
mehdi
joorabloo
Mehdi
Fuladipanah
Fatemeh
Naseri
Hamed
Sarkardeh
Morteza
Marosi
Using bottom outlets for drain and regulation of water level in reservior has significant importance in performance mahagment of dam. Amount of service and emergency gates opening have important role in pressure, velocity and discharge coefficient variations and finally dam performance. In the present research, flow aeration between emergency and service gates was studied with different hydraulic conditions in Karron 4 and GhizGhalasi dams with free and submerged downstream condtirions. Aeration coefficient was measured experimentally. Numerical simulations were also performed to analyze the pressure fluctuation in stilling basin after the gate using Flow3D software. Results showed that outlet submergence has reductive effect about 50% on flow aeration rate. On the other words, the submergence condition at outlet, will lead to increase cavitation occurrence probability, and therfore larger air vent will be needed. Also it was senn that aeration decreased pressure flaccuation on the stilling basin that it leads to eliminate cavitation occurance.
Bottom Outlet
Aeration Coefficient
Cavitation
Outlet Submergence
Numerical and Experimental Modeling
2017
07
01
73
82
http://wsej.iauahvaz.ac.ir/article_538176_4aeca68796fe39c09ccf994c84761aca.pdf
Journal of Water Science & Engineering
Journal of Water Science & Engineering
2251-6905
2251-6905
2017
7
16
Impact of Watershed Management activities on flood hydrograph Using HEC-HMS Model (Case Study: Ramyan Watershed)
Payam
Ebrahimi
Jamileh
Salimi Kouchi
Mohsen
Mohseni Saravi
Increasing the use of water and soil resources in watershed in recent years and unproductive and inappropriate use of land ecology has exacerbated the occurrence of floods. In this context, watershed management is one of the most effective ways to cope with this crisis. This research quantify the results of these activities by calculating the decreased volume and discharge due to biomechanical measures taken in the Ramyan watershed in Golestan province. Using the HEC-HMS model and taking into account the CN coefficients in three dry, moderate and wet periods, reduced peak discharge and volume with a return period of 2 to 500 years were estimated. In order to control the estimates, four events were used during the statistical period of 21 years from the hydrometric station and the rain station in the region. After optimizing the input CN values to the HEC-HMS model, peak discharge and total flood volume were estimated with accuracy of 3.16 and 11.3 percent. Investigations show that biomechanical operations can reduce the 10 years peak discharge by 40.72 percent, while the 20-year discharge will be reduced by 30.18 percent. On the other hand, hydrograph before and after biomechanical operations shows that the flood volume and peak discharge of Ramyan watershed has decreased with respect to time and the watershed management operation was effective. Thus, in general, the effect of watershed management operation emphasis on biomechanical measures on the flood discharge in the Ramyan watershed is positive.
Watershed Management
biomechanical measures
Assessment
flood control
Ecology
2017
07
01
85
98
http://wsej.iauahvaz.ac.ir/article_538177_d189fb418698c7c0477bcd48ad5198df.pdf
Journal of Water Science & Engineering
Journal of Water Science & Engineering
2251-6905
2251-6905
2017
7
16
Assessing the Quality Change of Some Parameters of Karun River Water at a Four -Year Interval
Ali
Asgar Kolahkaj
Ebrahim
Panahpour
Ali
Gholami
Surface water resources, especially rivers, are at risk more than other sources for the reason of many uses. This study aims to examine some quality parameters of Karun river water in the Gotovand spatial range to Ahwaz during the years of 2010-2013.The data investigated in this study were obtained from the annual mean biochemical parameters measurements at nine sampling stations at the Water Affairs Administration of Khouzestan province. To this end, it is used of post-test LSD test so as to investigate the process of river water quality changes. The results of the study shows that there was no significant difference in chemical oxygen demand (COD) among stations, but the mean dissolved oxygen (DO) and biochemical oxidation demand (BOD5) were significantly different between stations. It is observed that the highest average DO at station1 (Gotovand) at a rate of 17.7 milligrams per liter and the highest average at station 9 (Gorgor - Band-e-Ghir) at 4.39 milligrams per liter. Also, there is no significant difference of the average amount of dissolved oxygen (DO), but there is a decreasing process of average value BOD5 while increasing the average amount COD from 11.8 mg/L in 2010 to 20.2 mg/L in 2013 so that it indicates an increase in the chemical contamination of river water. The study of microbiological properties (total and excremental coli-forms) did not show any significant difference during the studied years, but among the contaminated stations the most contaminated stations were the stations No.5 (Gorgor-Shoshtar) and No. 15 (Ahwaz Fifth- bridge) with comparison to other stations. It indicates that there is the population density in these areas, as urban wastewater enters the river without any treatment. Considering that industrial and agricultural wastewaters are affecting factors for quality parameters, suggested that these wastewaters be allowed to drain into the river after proper treatment.
Karun river
Sampling Stations
Dissolved Oxygen
biological properties
Excremental Coli-Form
2017
07
01
99
114
http://wsej.iauahvaz.ac.ir/article_538181_4b755895bb2e753ece96254adb99a98c.pdf