Volume 38 (2024)
Volume 37 (2023)
Volume 36 (2022)
Volume 35 (2021)
Volume 34 (2020)
Volume 33 (2019)
Volume 32 (2018)
Volume 31 (2017)
Volume 30 (2016)
Volume 29 (2015)
Volume 27 (2013)
Volume 26 (2012)
Volume 25 (2011)
Volume 24 (2010)
Volume 23 (2009)
Volume 22 (2008)
Research Article
Use of Multiple Linear Regression Method for Modelling Seasonal Changes in Stable Isotopes of 18O and 2H in 30 Pouns in Gilan Province

M.A. Mousavi Shalmani; A. Lakzian; A. Khorasani; V. Feiziasl; A. Mahmoudi; A. Borzuee; N. Pourmohammad

Volume 28, Issue 2 , May and June 2014, Pages 239-252


  In order to assessment of water quality and characterize seasonal variation in 18O and 2H in relation with different chemical and physiographical parameters and modelling of effective parameters, an study was conducted during 2010 to 2011 in 30 different ponds in the north of Iran. Samples were collected ...  Read More

Research Article
Verification of Temperature and Precipitation Simulated Data by Individual and Ensemble Performance of Five AOGCM Models for North East of Iran

B. Ashraf; A. Alizadeh; M. Mousavi Baygi; M. Bannayan Awal

Volume 28, Issue 2 , May and June 2014, Pages 253-266


  Scince climatic models are the basic tools to study climate change and because of the multiplicity of these models, selecting the most appropriate model for the studying location is very considerable. In this research the temperature and precipitation simulated data by BCM2, CGCM3, CNRMCM3, MRICGCM2.3 ...  Read More

Research Article
Numerical Modeling of Local Scouring Around Group Bridge Piers and Compared with Experimental Results

B. Mohammadnezhad; J. Behmanesh

Volume 28, Issue 2 , May and June 2014, Pages 267-275


  Bridges are the most important structures in river engineering. One of the most causes in bridges destruction is local scouring around the bridge piers. Many bridges failed in the world because of the extreme scour around piers, which have caused to disappear a lot of investments. Then, it is essential ...  Read More

Research Article
Evaluation of Maize Yield Variability Based on Soil Properties and Principal Component Analysis

M. Ghaemi; A. Astaraei; M. Nassiri Mahalati; S.H. Sanaeinejad; H. Emami

Volume 28, Issue 2 , May and June 2014, Pages 276-285


  Successful implementation of soil and crop management program requires quantitative knowledge of site characteristics and interactions that affect crop yield. Soil properties are one of the most important site variables affecting within- field yield variability. The objective of this research was to ...  Read More

Research Article
Comparison of the Effects of Flow Pattern and Bed Slope on Sediment Transport in Laboratory Conditions

Ashkan Alebouyeh; Saeed Reza Khodshenas

Volume 28, Issue 2 , May and June 2014, Pages 286-295


  Flash flood is due to rapid precipitation in arid and semi-arid areas. This flood is example of unsteady flow which has hydrograph with little time duration and high discharge. Investigation behavior of these floods is very important on sediment transport and characteristics streams. In this research ...  Read More

Research Article
Trending Changes of the Reference Crop Water Requirement and its Associated Meteorological Variables in East Azerbaijan

Hamid Mirhashemi

Volume 28, Issue 2 , May and June 2014, Pages 296-306


  In this study, in order to analyze the changes trend of the crop water requirement as the aspect of climate change in East Azerbaijan, we have adopted FAO Penman- Monteith reference crop evapotranspiration and 15 variables associated with it. By using nonparametric methods of Spearman, Man- Kendall ...  Read More

Research Article
Effect of Contraction Geometry on Hydraulic Parameters of Shock Waves

Mohammad Reza Nikpour; Davoud Farsadi

Volume 28, Issue 2 , May and June 2014, Pages 307-318


  Formation of shock waves has an important role in supercritical flows studies. These waves are often occurring during passage of supercritical flow in the non-prismatic channels. In the present study, the effect of length and convergence of contraction wall of open-channel was investigated on hydraulic ...  Read More

Research Article
Surface Shear Strength Modeling Using Soil and Environmental Attributes in Landscape Scale (Semirom District, Isfahan Province)

shamsollah Ayoubi; Mohammad Reza Mosaddeghi

Volume 28, Issue 2 , May and June 2014, Pages 319-329


  Soil surface shear strength is an important parameter for prediction of soil erosion, but its direct measurement is difficult, time-consuming and costly in the watershed scale. This study was done to predict soil surface shear strength using artificial neural networks (ANNs) and multiple linear regression ...  Read More

Research Article
Determination of Soil Phosphorus Critical Level for Corn plant in East Azerbaijan Province

Adel Reyhanitabar

Volume 28, Issue 2 , May and June 2014, Pages 330-342


  Knowledge about the P critical level and plant response to application of P can effectively help with the proper use of this element. In this study, P critical level for corn (Zea mays L.) was determined in 25 combined soils samples from corn fields of East Azerbaijan province during 2011-2012. Corn ...  Read More

Research Article
Comparison of CE-QUAL-W2 and DYRESM Models in Simulating Heat Distribution within 15 Khordad Reservoir

Mohamad Ebrahim Khajepour

Volume 28, Issue 2 , May and June 2014, Pages 343-352


  Dynamic stream flow (River Ecosystem) becomes static mound (Lake Ecosystem) after constructing dam on the river. The most important difference between them is of retention time and stratification which induce different qualification to water river prior to reservoir and afterwards. In this study, heat ...  Read More

Research Article
Comparison of Geostatistical and Conventional Mapping Methods in Determining the Variation of Selected Soil Properties (Case study: Jiroft, Kerman Province)

Ali reza Karimi; Isa Esfandiarpour Borujeni

Volume 28, Issue 2 , May and June 2014, Pages 353-364


  Soil maps are the common sources of soil information for land evaluation and land use planning. The objective of this study was to evaluate the capability of conventional and geostatistical methods for mapping selected physical (sand, silt and clay) and chemical (carbonate calcium equivalent and pH) ...  Read More

Research Article
Compared to The Normal Mechanism Becomes The Normal Monthly Rainfall Data from Different Regions of Iran

Mohammad Nazeri Tahrudi

Volume 28, Issue 2 , May and June 2014, Pages 365-372


  The application of statistical theory and probability analysis of hydrologic time series is assumed that the variables are normally distributed. Since many time series are not normal, it is required prior to any analysis and modeling, they looked normal. This conversion is done by Const. In this study, ...  Read More

Research Article
Definition and Mapping of an Integrated Micronutrient Deficiency Index Based on Phytoavailable Cu, Zn, Mn and Fe Soil Concentrations in the Boroujen–Faradonbeh Plain

habib beigi

Volume 28, Issue 2 , May and June 2014, Pages 383-393


  Boroujen–Fradonbeh plain is one of the nine main agricultural hubs of Charmahal Provine. The aim of this study was to define and map a deficiency index of soil micronutrients and the effect of wastewater application on it. For this, 200 surface soil (0-30 cm) samples were randomly collected and plant ...  Read More

Research Article
Study Micromorphology Properties of Soils on Different Geomorphic Surfaces in South Roudbar Playa (Part of the Jazmoryan)

saleh sanjari; Saeid Barkhori

Volume 28, Issue 2 , May and June 2014, Pages 373-382


  Geomorphologies have an important role in soil genesis and micromorphology. So for survey of pedogenic processes at different levels of geomorphic awareness of soil micromorphology a characteristic is essential. In this study micromorphological properties of soils in the south Roudbar region, part of ...  Read More

Research Article
River Flow Forecasting by Using Soft computing

sarvin ghavidel; sarvin zamanzad ghavidel

Volume 28, Issue 2 , May and June 2014, Pages 394-405


  Forecasts of streamflows are required for many activities associated with the planning and operation of components in a water resource system. This paper demonstrates the application of two different intelligent approaches including adaptive neuro-fuzzy (ANFIS) based on grid partition and Gene Expression ...  Read More

Research Article
Experimental Investigation of Effect of Sill Location on Local Scour Around Inclined Bridge Piers Group

mahdi esmaeli varaki

Volume 28, Issue 2 , May and June 2014, Pages 406-419


  After construction of bridge pier in a river, a 3D complex flow pattern forms around piers and erosion of bed material occurs and if foundation depth or piles depth was not sufficient, the bridge will be collapsed. One of devices to reduction of scour around bridge piers is an installation of sill beside ...  Read More

Research Article
Estimating Reference Evapotranspiration by Using Principal Component Analysis (PCA) and The Development of a Regression Model (MLR-PCA) (Case Study: Mashhad Station)

nona sheikholeslami

Volume 28, Issue 2 , May and June 2014, Pages 420-429


  Evapotranspiration is one of the most important parameters that its understanding is necessary for estimating crop water requirement and design of irrigation systems. This phenomenon is greatly influenced by climatic parameters. In this study, the relative importance of variables affecting this phenomenon ...  Read More

Research Article
Measuring and Simulation of Nitrate Leachate Using LEACHN Model
Volume 28, Issue 2 , May and June 2014, Pages 430-439


  In many areas, the main source of surface and groundwater nitrogen pollution is agriculture and simulation models are useful tools in determining the contribution of nitrogen produced by agriculture in pollution of water resources. In this research, leaching of nitrate on a loam-silty to loam soil was ...  Read More

Research Article
Capability Assessment of GIUH Method for Predicting the Dimension of Instantaneous Unit Hydrograph and Compare it with Snyder, SCS and Triangular Methods

Ali Golkarian

Volume 28, Issue 2 , May and June 2014, Pages 440-450


  One of the most important objectives in hydrological studies is quantitative rainfall-runoff process estimation at the basin. Several methods and models have been created in order to simulate the Rainfall-Runoff process that each one has its’ own advantages and disadvantages. The aim of this study ...  Read More