Volume 39 (2025)
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 28 (2014)
Volume 27 (2013)
Volume 26 (2012)
Volume 25 (2011)
Volume 24 (2010)
Volume 23 (2009)
Volume 22 (2008)
Evaluation of the Efficiency of Data Preprocessing Methods on Improving the Performance of Gene Expression Programming Model (Case Study: Ab Zal River)

F. Ahmadi

Volume 35, Issue 2 , May and June 2021, , Pages 153-165

https://doi.org/10.22067/jsw.2021.14975.0

Abstract
  Introduction: Surface water has always been one of the most essential pillars of water projects and, with modeling and predicting the river flow, in addition to the management and utilization of water resources, it is possible to inhibit the natural disasters such as drought and floods. Therefore, researchers ...  Read More

Application of Archimedean and Extreme values Copula Functions for Multivariate Analysis of Low Flows in Dez Basin

F. Ahmadi; F. Radmanesh; G. A. Parham; R. Mirabbasi Najaf Abadi

Volume 31, Issue 4 , September and October 2018, , Pages 1031-1045

https://doi.org/10.22067/jsw.v31i4.58373

Abstract
  Introduction: Hydrological phenomena are often multidimensional and very complex. Hence, the joint modeling of two or more random variables is required to investigate the probabilistic behavior of them. To this aim, the copulas can be efficiently utilized to derive multivariate distributions. In addition, ...  Read More

Temperature Trend Analysis by Considering the Hurst Coefficient (Case Study: West Azarbayjan Province)

Farshad Ahmadi; Mohammad Nazeri Tahroudi; Rasoul Mirabbasi Najaf Abadi

Volume 31, Issue 3 , July and August 2018, , Pages 985-1000

https://doi.org/10.22067/jsw.v31i2.56035

Abstract
  Introduction: Climate change in the current century is an important environmental challenge facing the world. Increase in atmospheric concentration of greenhouse gases such as CO2 as a result of human activities has caused a change in a number of hydroclimatic parameters. Climate change and global warming ...  Read More

Evaluation the Trend and Trend Chang Point of Urmia Lake Basin Precipitation

Mohammad Nazeri Tahrudi; Farshad Ahmadi; Keivan Khalili

Volume 31, Issue 2 , May and June 2017, , Pages 644-659

https://doi.org/10.22067/jsw.v31i2.55338

Abstract
  Introduction: Given the fact that Iran is located in the center of the dryland of earth and is significantly influenced by the deserts of Central Asia and hot dry deserts of Arabia and Africa, is one of the most arid and low rainfall land areas.So is the proper management of water resources is of critical ...  Read More

Investigation the Concentration and Trend of Winter Precipitation of Iranian Border Stations over the Last Half Century

Keyvan Khalili; Mohammad Nazeri Tahrudi; Rasoul Mirabbasi Najaf Abadi; Farshad Ahmadi

Volume 30, Issue 4 , September and October 2016, , Pages 1309-1321

https://doi.org/10.22067/jsw.v30i4.45639

Abstract
  Introduction: Climate change in the current era is a very important environmental challenge. Our understanding of the impacts of human activities on the environment, especially those related to global warming caused by increased greenhouse gases indicates that, most probably, a number of hydro-climatic ...  Read More

Spatial and Regional Analysis of Precipitation Trend over Iran in the Last Half of Century

Mohammad Nazeri Tahrudi; Keivan Khalili; Farshad Ahmadi

Volume 30, Issue 2 , May and June 2016, , Pages 643-654

https://doi.org/10.22067/jsw.v30i2.39130

Abstract
  Introduction: Climate change has been one the most important subject in studies in the recent decades. Precipitation is an effective climatic parameter in the municipal and rural studies and in the industry, architecture, agriculture, climate and other fields. Trend analysis of average monthly and yearly ...  Read More

Application of ANFIS and SVM Systems in Order to Estimate Monthly Reference Crop Evapotranspiration in the Northwest of Iran

F. Ahmadi; S. Ayashm; K. Khalili; J. Behmanesh

Volume 30, Issue 1 , March and April 2016, , Pages 260-274

https://doi.org/10.22067/jsw.v30i1.38287

Abstract
  Introduction Crop evapotranspiration modeling process mainly performs with empirical methods, aerodynamic and energy balance. In these methods, the evapotranspiration is calculated based on the average values of meteorological parameters at different time steps. The linear models didn’t have a good ...  Read More

Comparison between Genetic Programming and Support Vector Machine Methods for Daily River Flow Forecasting (Case Study: Barandoozchay River)

F. Ahmadi; F. Radmanesh; Rasoul Mirabbasi

Volume 28, Issue 6 , January and February 2015, , Pages 1162-1171

https://doi.org/10.22067/jsw.v0i0.32406

Abstract
  Accurate estimation of river flow can have a significant importance in water resources management. In this study, Genetic programming (GP) and Support Vector Machine (SVM) methods were used to forecast daily discharge of Barandoozchay River. The daily discharge data of Barandoozchay River measured at ...  Read More

Comparison of the Gen Expression Programming, Nonlinear Time Series and Artificial Neural Network in Estimating the River Daily Flow (Case Study: The Karun River)

R. Zamani; F. Ahmadi; F. Radmanesh

Volume 28, Issue 6 , January and February 2015, , Pages 1172-1182

https://doi.org/10.22067/jsw.v0i0.32553

Abstract
  Today, the daily flow forecasting of rivers is an important issue in hydrology and water resources and thus can be used the results of daily river flow modeling in water resources management, droughts and floods monitoring. In this study, due to the importance of this issue, using nonlinear time series ...  Read More

Trend Analysis of Monthly and Annual Mean Temperature of the Northern Half of Iran Over the Last 50 Years

F. Ahmadi; F. Radmanesh

Volume 28, Issue 4 , September and October 2013, , Pages 855-865

https://doi.org/10.22067/jsw.v0i0.29721

Abstract
  The temperature is one of the essential elements in formation of climate and its changes can alter the climate of each region, Therefore study of temperature changes at different spatial and temporal scales is devoted a large part of research to climatology. The mean temperature changes of the northern ...  Read More

Introducing and Application of Combined BL-ARCH Model for Daily River flow Forecasting (Case study: Shahar-Chai River)

A. Fakheri Fard; yaghoub dinpazhoh; F. Ahmadi; J. Behmanesh

Volume 27, Issue 2 , May and June 2013, , Pages 342-350

https://doi.org/10.22067/jsw.v0i0.24360

Abstract
  One of the applicable ways for simulation and forecasting hydrological processes is time series modeling. An important problem in forecasting hydrological data using time series is generating stochastic data. Any changes in stochastic series will change generating data. In this study nonlinear ARCH model ...  Read More