-
Open Access Article
1 - Evaluating the Efficiency of Earth2Observe Re-Analysis Dataset and VIC-3L for Estimation of Runoff
Sakine Koohi Asghar Azizian Luca BroccaThe main objective of this study is to assess the performance of Earth2Observe's GHMs and LSMs reanalysis models in estimating runoff at the outlet of Sefidrood river basin (SRB). In addition, for better evaluating the efficiency of Earth2Observe uncalibrated models, th MoreThe main objective of this study is to assess the performance of Earth2Observe's GHMs and LSMs reanalysis models in estimating runoff at the outlet of Sefidrood river basin (SRB). In addition, for better evaluating the efficiency of Earth2Observe uncalibrated models, the VIC-3L land surface model is implemented over the SRB and calibrated using observed discharges. Results showed that, based on CC and NS statistics, the performance of SURFEX-TRIP model in both daily and monthly time scales is the best one and it led to the same results as well as VIC-3L calibrated model. The values of CC and NS statistics, at daily time scale, in the case of SURFEX-TRIP model are 0.75 and 0.55, respectively, while at the monthly time scale these values are 0.86 and 0.73, respectively. As an overall, findings indicate that LSMs performs better than GHMs in simulating runoff and this may be due to the ability of LSMs in considering both water and energy budgets and they can exchange energy and mass between land surface and atmosphere. Therefore it is highly recommended to use the results of reanalysis models as an appropriate guidance, particularly in the case of ungauged catchments. Manuscript profile -
Open Access Article
2 - Estimation of Evapotranspiration Using Reanalysis Models based on Global Earth Observations at Distinct Climate Regions of Iran
Asghar Azizian bahareh bahman abadi Mahnoosh JenabAccurate estimation of evapotranspiration is one of the most important issues in water balance calculation at the catchment and field scale. The lack of meteorological observations for using empirical methods and the high costs of measuring evapotranspiration using lysi MoreAccurate estimation of evapotranspiration is one of the most important issues in water balance calculation at the catchment and field scale. The lack of meteorological observations for using empirical methods and the high costs of measuring evapotranspiration using lysimeter restricts the usability of these methods in most cases. To tackle these problems, this research addressed the performance of reanalysis models including W3RA, HBV-SIMREG, PCR-GLOBW, WATER-GAP, and Ensemble for estimation of evapotranspiration at different climate regions of Iran. Besides, the reference evapotranspiration for assessment of the above models obtained using lysimeter measurements. Findings showed that in most cases studies the Ensemble model’s performance with the RMSE value ranges from 3.42 to 7.57 mm/day is the weakest one, while the results of HBV-SIMREG and W3RA show the best agreements with lysimeter dataset. Analyzing the outputs based on mean bias error (MBE) depicted that the estimated evapotranspiration based on W3RA and Ensemble have the minimum and maximum bias, respectively. As an overall conclusion, although results indicate that PCR-GLOBW has the maximum correlation coefficient (CC) with the reference datasets, HBV-SIMREG is the best and reliable model for estimation of evapotranspiration in most climate regions of Iran and can be considered as an alternative dataset, especially in data-limited areas. Manuscript profile -
Open Access Article
3 - Comparison of MIKE NAM and AWBM models performance in simulation of daily runoff in Gokbad Catchment in Hamedan province
Yasamin Sajadi Bami Jahangir Porhemmat Hossein Sedghi Navid JalalkamaliApart from the understanding of the impact of land use and climate changes on the water cycle and hydrology regime, hydrological models are effective tools for designing and managing water resources. Currently, many hydrological models have been developed to simulate th MoreApart from the understanding of the impact of land use and climate changes on the water cycle and hydrology regime, hydrological models are effective tools for designing and managing water resources. Currently, many hydrological models have been developed to simulate the basin, though choosing the right model is a challenge. To this end, a correct understanding of the model, its advantages, and limitations is necessary. In this regard, several studies have been conducted to evaluate the hydrological models performance in different regions and conditions. In the present study, the performance of two integrated hydrological and conceptual rainfall-runoff models of AWBM and MIKE NAM in the simulation of the average daily runoff in Gonbad Hamedan basin was investigated. Although both models are lumped models for rainfall-runoff process, the MIKE NAM model has a more complex structure compared to the AWBM. In addition to considering the initial conditions, MIKE NAM model is also capable of simulating snowmelt. The results of the runoff simulation during the calibration and validation periods were evaluated using two statistical indicators of the Nash-Sutcliffe efficiency (NSE) and percent bias (PBIAS). The NSE and PBIAS during the calibration and validation periods for the MIKE NAM model were 0.8, 6.3 and 0.71, -4.2; and 0.6, 14.33 and 0.55, -9.2 for AWBM model, respectively. The results showed that MIKE NAM model has a better performance in simulating daily runoff in Gonbad Moarref basin compared to the AWBM model. Manuscript profile -
Open Access Article
4 - Simulation of Stream Flow Hydrographs Using Flexible Distributed Hydrological Model (WetSpa) in Khorram Abad Basin
ehsan fatapour Ali Afrous babak aminnejad Ali Saremi amir khosrojerdiBackground and Purpose: The use of hydrological models in watersheds has always been of interest to water resources researchers. Hydrological simulation models are valuable tools for investigating challenging issues related to watershed management, such as the effect of MoreBackground and Purpose: The use of hydrological models in watersheds has always been of interest to water resources researchers. Hydrological simulation models are valuable tools for investigating challenging issues related to watershed management, such as the effect of climate change on water resources and the effect of urbanization on floods and droughts. Spatial distribution hydrological model WetSpa is used to simulate river flow at basin scale. The model uses the observed topography, land use, soil map, and daily meteorological time series (rainfall, evaporation and temperature) to predict hydrographs and distributional-spatial hydrological parameters of the basin. In this article, the object-oriented, modular and process-oriented model of WetSpa, which is prepared based on the flexible modeling approach, is applied to simulate the daily hydrograph in Khorramabad basin.Method: The inputs of the model include digital elevation maps, soil type, land use, and time series of precipitation, temperature, and potential evaporation and transpiration, which are from the statistics of 6 meteorological stations in a ten-year period (water year 84-85 until 93-94) is used. After preparing the inputs of the model, at first the maps of the distribution parameters are automatically generated in the map format by the GIS pre-processing component of the model. After that, the model is calibrated using a 5-year statistical period (water year 84-85 to 89-88) of precipitation, temperature, and potential evaporation and transpiration data. The model uses Thiessen polygons to apply precipitation, temperature, and evaporation data. For this purpose, the daily discharges of Jam Anjir hydrometric station located at the outlet of the studied watershed are used. Model calibration is done manually by determining the values of 11 global (general) parameters of the model, so that the best match between simulation and observational hydrograph is obtained. And finally, the validation of the model is carried out based on a 5-year statistical period (water year 89-88 to 94-93) and the values of the global parameters obtained in the calibration stage.Findings: The maps of distributed parameters are produced, which after preparing the inputs of Mashdand's production model showed that the average potential runoff coefficient of the area is 63% and the concentration time of the area is 17 hours. In the following, according to the 11 global parameters, which symbol and range of changes are specified in table (3), the model global (general) parameters values are obtained in the calibration stage. Comparing the simulated hydrograph by the model and the observed hydrograph in the calibration stage shows that the best match between the observed and simulated data is established with a correlation coefficient of 0.39. Validation of the model is also based on a 5-year statistical period (water year 89-88 to 94-93) and the values of global parameters. The output files of the model illustrate that 26.15% of the precipitation becomes runoff during the calibration period. During the validation period, the share of total runoff from precipitation is 26.42%. Moreover, the simulation results of the model demonstrate the ratio of evaporation to precipitation in the calibration and validation periods is 57.18 and 69.20%, respectively. Additionally, the results of the evaluation of the model based on the Kling-Gupta index (KGE) present the value of 0.68 for the calibration period and 0.74 for the validation period.Results: In this article, the effectiveness of WetSpa model is investigated in order to simulate the daily flow of Khorram Abad River at Cham Anjir hydrometric station. According to the results obtained from this research, it can be said that the Wetspa spatial distribution model has the ability to simulate the hydrological behavior of the basin with acceptable accuracy. The graphical comparison of the calculated and observed hydrographs for the calibration and evaluation period also shows a relatively good match between the two hydrographs. Examining the results of calculating of the water balance components by the model demonstrates that the outflow in the calibration and validation period accounted for 26.15 and 26.42% of the total precipitation respectively, seems logical considering the major land use of mountains and pastures in the irrigation basin. Manuscript profile -
Open Access Article
5 - Modeling the Effects of Land Use Change on Surface Runoff in the Watershed of Khorramabad Using RS and GIS Integration Model and L- THIA
hadis rashidi Ali Haghizadeh Hossein zeinivand Naser TahmasebipourBackground and Objective: land use change, mainly socio-economic benefits to follow. However, these changes have negative effects on the natural environment. Due to the high volume of runoff from a lack of permeability in the city and Non-use of certain areas or any str MoreBackground and Objective: land use change, mainly socio-economic benefits to follow. However, these changes have negative effects on the natural environment. Due to the high volume of runoff from a lack of permeability in the city and Non-use of certain areas or any structure in addition to the problem of flooding in low-lying areas for water infiltration in several studies to develop models with simulation approach to land use changes have taken place. In this study, L-THIA model for estimating runoff from land use changes in the area of Khorramabad is used. The Model of L-THIA, a model to assess long-term effects land use change on water resources using simple and availability data Such as long-term climate data, land use map and soil map applicable. Methods: This study was conducted in a period of 10 years and in the period of 2004-2014. Landsat images from the site the US Geological Survey has been downloaded and various corrections have been made. Land use maps were prepared and used using Landsat 7 satellite images of ETM sensors and Landsat 8 images of OLI sensors related to 2004 and 2014, respectively. Precipitation data are provided by the Regional Water Authority. After sorting, they are prepared for future analysis. By combining land use map and soil texture map in GIS software, the soil hydrological group is produced. Finally, the prepared maps are given to the L-THIA model and the effect of land use change on surface runoff is investigated.Findings: The results of modeling using L-THIA, increased annual runoff in ten years shows that this increased volume of runoff and the need for control over land use change in the region. User modifications to increase mainly in residential areas and loss of woodland and grassland.Discussion and Conclusion: As the results of this study show, the L-THIA model has a good ability to express the effect of land use change on the volume and depth of runoff. Also, using the results of the study, it is possible to prepare control programs for land use changes to prevent runoff in the area. Manuscript profile -
Open Access Article
6 - Hydrological Simulation of Taleqan Watershed Using SWAT
Mahsa Aghakhani Touraj Nasrabadi Alireza Vafaei NejadBackground and Objective: Hydrological modeling of watersheds plays a significant role in study, development and management of water resources. Based on importance of Taleqan Watershed as a main supplier of Alborz and Tehran Provinces water resources, in this study, sur MoreBackground and Objective: Hydrological modeling of watersheds plays a significant role in study, development and management of water resources. Based on importance of Taleqan Watershed as a main supplier of Alborz and Tehran Provinces water resources, in this study, surface water hydrological simulations in this basin are investigated. Method: Hydrological simulations were performed by applying physical semi-distributed SWAT (Soil and Water Assessment Tool) model. Moreover, model calibration and sensitivity analysis were done using SUFI-2 algorithm. Model performance is evaluated by means of statistical indicators such as Nash-Sutcliffe (NS) and coefficient of determination (R2). Findings: Sensitivity analysis showed that the parameters of the curve number (CN), soil evaporation compensation, and soil available water capacity are the most important factors to control the flow in the basin. At Gelinak station (watershed outlet), NS and R2 coefficients values after calibration are 0.84 and 0.87, respectively. These values in validation interval were obtained as 0.79 and 0.84. Discussion and Conclusion: The results show good performance of the watershed simulations. Moreover, it was shown that the model has good capability for monthly surface runoff prediction of the Taleqan basin. Due to reducing field operations costs of required components measurements and especially due to reducing the time required to analyze issues, applying this model is efficient for improving water resource management and environmental protection. Manuscript profile -
Open Access Article
7 - The Behavior of Inflow to the Seimareh Dam in the Face of Climate Change Impacts
Mohammadreza Goodarzi Hamed Vagheei Mirrahim MousaviBackground and Objective: The importance of environment protection has caused different countries benefit from renewable and clean sources to generate electricity. This has led to the development of hydropower plants around the world. Also, there are different hydroelec MoreBackground and Objective: The importance of environment protection has caused different countries benefit from renewable and clean sources to generate electricity. This has led to the development of hydropower plants around the world. Also, there are different hydroelectric projects in Iran that the Seimareh Dam & Hydropower Plant is amongst them. Since climate change can alter the hydrologic conditions of different areas and the performance of hydraulic structures, this study aims to examine the impacts of this phenomenon on the inflow to the Seimareh Dam. Method: Climate conditions in the future period (2040 to 2069) are predicted for the study area using HadCM3 model under A2 and B2 scenarios as well as CanESM2 model under RCP2.6, RCP4.5 and RCP8.5 scenarios by the Statistical DownScaling Method (SDSM model). Also, this study uses HEC-HMS hydrologic model to simulate river flow. Findings: The results of the present study show that temperature of the area increases in the future period to different scenarios, in such a way that the highest amount of increase for maximum and minimum temperature in the future period has been predicted for RCP8.5 respectively about 1.2 and 1.3 Centigrade. It is predicted that the mean annual amount of rainfall will reduce as well. Also, the assessment of simulated river flow shows that inflow to the Seimareh Dam will decrease about 5.2 to 13.4 percent in the future period. Discussion and Conclusion: The results of the present study show the importance and necessity of considering the climate change impacts in designing important hydraulic structures such as dams and hydropower plants. Manuscript profile
Sanad
Sanad is a platform for managing Azad University publications
Links
Related Centers
Technical Support
Official pages
The rights to this website are owned by the Raimag Press Management System.
Copyright © 2021-2024