Journal of Water Science & Engineering: 1 (30)

Open Access Article

1 - Evaluation of different infiltration equations under some soil textures presented in HYDRUS model
علی جوادی

Infiltration is one of the important parameters in the management and design of irrigation and drainage systems. Infiltration measurement problems make it reasonable to estimate it using simulation models. The main purpose of this study was to investigate the performanc More

Infiltration is one of the important parameters in the management and design of irrigation and drainage systems. Infiltration measurement problems make it reasonable to estimate it using simulation models. The main purpose of this study was to investigate the performance of different infiltration equations (Kostiakov-Lewis, Philip and Horton) in surface irrigation using the HYDRUS model. For this purpose, one-dimensional and two-dimensional cumulative infiltration was simulated by changing the initial soil water (before irrigation) and water head (during irrigation) using the Richards equation (HYDRUS model). Five soil textures based on the HYDRUS model database were considered for infiltration simulation. The cumulative infiltration depth, with respect to time, was used to develop different infiltration equations using the Microsoft Excel 2016 (Solver tool). Investigation of the performance of different infiltration equations in different simulations of surface irrigation showed that The Kostiakov-Lewis and Philip equations penetration with absolute total error of 1.5% and 3.5%, respectively, had the best and worst performance in estimating the amount of penetration. According to the obtained results, it is suggested to use Kostiakov-Lewis infiltration equation in surface irrigation systems, which has the best performance in estimating the amount of infiltration. Infiltration is one of the important parameters in the management and design of irrigation and drainage systems. Infiltration measurement problems make it reasonable to estimate it using simulation models. The main purpose of this study was to investigate the performance of different infiltration equations (Kostiakov-Lewis, Philip and Horton) in surface irrigation using the HYDRUS model. For this purpose, one-dimensional and two-dimensional cumulative infiltration was simulated by changing the initial soil water (before irrigation) and water head (during irrigation) using the Richards equation (HYDRUS model). Five soil textures based on the HYDRUS model database were considered for infiltration simulation. The cumulative infiltration depth, with respect to time, was used to develop different infiltration equations using the Microsoft Excel 2016 (Solver tool). Investigation of the performance of different infiltration equations in different simulations of surface irrigation showed that The Kostiakov-Lewis and Philip equations penetration with absolute total error of 1.5% and 3.5%, respectively, had the best and worst performance in estimating the amount of penetration. According to the obtained results, it is suggested to use Kostiakov-Lewis infiltration equation in surface irrigation systems, which has the best performance in estimating the amount of infiltration. Manuscript profile

Open Access Article

2 - Laboratory study of flow coefficient at the spillway - gate composite structure by creating triangular congresses in the spillway wing
امیر رضا بهره بر حسین آذر پیوند رسول فرهادی

Combining the overflow with the gate causes changes in the discharge coefficient. Spillway- gate composite structure is used behind the overflow to measure the flow rate and prevent the accumulation of sediment in winter when the water is muddy. In this research, by des More

Combining the overflow with the gate causes changes in the discharge coefficient. Spillway- gate composite structure is used behind the overflow to measure the flow rate and prevent the accumulation of sediment in winter when the water is muddy. In this research, by designing and constructing four combined models of square congress spillways with gates, the effect of hydraulic parameters such as water pressure on the spillway (h) and geometric parameters such as gate height (a), gate width (b) and the distance between the top Apertures up to the vertex of triangle (y) were examined on the coefficient of flow. The experimental results showed that the discharge coefficient decreases with increasing proportions of h/y, h/b and h/a and the hybrid model has more gates -like performance. Also, a relation was presented to estimate the flow rate R2 = 0.98. Sensitivity analysis of the relationship showed that the dimensionless ratio h/y has the highest sensitivity and effect. And finally, in places where we have a limit on the width of the spillway, by implementing these types of overflows and, most importantly, by creating a valve in the body of the overflow, that is, in combination, the amount of flow will increase, which is very important. Manuscript profile

Open Access Article

3 - Study of the most appropriate method for estimating effective rainfall to determine the water requirement of rainfed wheat in Isfahan
شمیم لاریجانی محمد سالاریان حسین بانژاد معصومه نجفی

Calculating the amount of effective rainfall as one of the water supply sources required for wheat cultivation is one of the basic study measures that can be used in the relevant planning. Therefore, identifying and applying a suitable method for estimating effective ra More

Calculating the amount of effective rainfall as one of the water supply sources required for wheat cultivation is one of the basic study measures that can be used in the relevant planning. Therefore, identifying and applying a suitable method for estimating effective rainfall, especially in rainfed cultivation, is doubly important. In this study, various methods of determining effective rainfall were evaluated, including: US Department of Agriculture (SCS) Soil Conservation Service Methods, Reliable, Experimental, USDA) Percentage and Renfro Method, using SPSS software and by testing. Duncan's statistics are given in the city of Isfahan for the cultivation of rainfed wheat. The results of this evaluation show that the Renfro method has not been accepted because it shows the effective rainfall values more than the rainfall itself. Reliable and experimental SCS methods and precipitation are more suitable for wet areas due to high negative values (zero). The results show that the percentage method and USDA are more consistent with the amount of precipitation than other methods. Due to greater compliance with the average monthly rainfall, the best method for calculating effective rainfall in Isfahan and USDA for wheat was proposed. Manuscript profile

Open Access Article

4 - Evaluation performance SALTMED Model to estimate corn yield in terms of common irrigation plains Shahrekord and Khanmyrza
حامد ریاحی فارسانی روح اله فتاحی نافچی

International communities have been highly regarded to conservation of soil and water. Models can be useful tools for agricultural water management. They also can be useful for irrigation scheduling and crop water requirement calculations as well as predictions crop yie More

International communities have been highly regarded to conservation of soil and water. Models can be useful tools for agricultural water management. They also can be useful for irrigation scheduling and crop water requirement calculations as well as predictions crop yield. In this study SALTMED model using data corn fields in plains Khanmyrza and ShahreKord to simulate the amount of yield was evaluated. The results of analysis and simulation data obtained showed no significant difference between the two values. The amount of root mean square error (RMSE) 9.84, coefficient of residual mass (CRM) -0.127 and the coefficient of determination (EF) -0.329 were obtained. All results show that the model can be successfully SALTMED suitable tool for managing irrigation and predict product performance in the field is irrigated Chaharmahal and Bakhtiari province. Manuscript profile

Open Access Article

5 - Optimization of Karaj Dam reservoir using modern ant Colony algorithm
حمید رضا عزیزی سعید عزیزی سید حبیب موسوی جهرمی

The ant colony algorithm is inspired by studies and observations on ant colonies. Since ants' colony optimization methods are able to significantly reduce computational time and at the same time improve results, the present study aims to determine the optimal utilizatio More

The ant colony algorithm is inspired by studies and observations on ant colonies. Since ants' colony optimization methods are able to significantly reduce computational time and at the same time improve results, the present study aims to determine the optimal utilization of water engineering issues. , Karaj Dam reservoir was used to study and implement this algorithm. This study was conducted with the aim of optimizing water reservoirs, by case study of Karaj Dam by the ant colony optimization algorithm. Meteorology was prepared by the Meteorological Organization and the Regional Water Organization of Alborz Province for a period of 5 years from 2010 to 2015. After correcting and reconstructing the data, an algorithm was proposed to optimize the Karaj Dam reservoir. This process was then implemented and tested by MATLAB software. The results showed that the use of modern ant colony optimization algorithm in solving dam optimization problems showed good results, which was consistent with the results of genetic algorithm methods and dynamic programming. And sometimes it looks better than them. However, in order to obtain optimal solutions, the solution process should be tested in different phases of problem solving and using the best conditions compared to other ants optimization approaches, the appropriate solution system should be selected to answer Get the right ones Manuscript profile

Open Access Article

6 - Determining the potential evapotranspiration in Isfahan province using GIS zoning and cluster analysis
هاجر طاهری سودجانی سید سعید اسلامیان ایمان اسدی ارجتکی

Evapotranspiration of plant is one of the most important parameter which is used for estimating consumed water and irrigation planning. Accurate determination of water demand plays an important role in the economic management of water resources, planning and determining More

Evapotranspiration of plant is one of the most important parameter which is used for estimating consumed water and irrigation planning. Accurate determination of water demand plays an important role in the economic management of water resources, planning and determining capacity of irrigation and drainage networks and simulating plant products. The present study attempted to investigate and optimize Evapotranspiration of reference crop in Isfahan province and provide it in form of GIS zoning as a major tool for water management. In additions, homogenous areas of this province were identified in terms of Evapotranspiration and some equations were presented for computing Evapotranspiration for each homogenous area. Results of computing Evapotranspiration from software Ref-ET and results of GIS zoning evapotranspiration have shown that there is a good correlation between Evapotranspiration computed by software GIS Evapotranspiration computed by software Ref-ET (R2=0.86%). In Isfahan, 3 homogenous areas were identified by the using cluster analysis method and given equations for homogenous area estimate amount of evapotranspiration with a high correlation Manuscript profile

XML

List of Articles