Browsing by Author "Vaheddoost, Babak"
Now showing items 1-18 of 18
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Application of hybrid ANN-whale optimization model in evaluation of the field capacity and the permanent wilting point of the soils
Vaheddoost, Babak; Guan, Yiqing; Mohammadi, Babak (Springer Heidelberg, 2020)Field capacity (FC) and permanent wilting point (PWP) are two important properties of the soil when the soil moisture is concerned. Since the determination of these parameters is expensive and time-consuming, this study ... -
Application of Signal Processing in Tracking Meteorological Drought in a Mountainous Region
Vaheddoost, Babak; Safari M.J.S. (Birkhauser, 2021)This study addresses the application of signal processing in the evaluation of meteorological drought associated with monthly precipitation time series. Several drought indices and a Haar wavelet decomposition (WD) with ... -
Conceptualization of the indirect link between climate variability and lake water level using conditional heteroscedasticity
Fathian F.; Vaheddoost, Babak (Taylor and Francis Ltd., 2021)This study investigates the indirect effect of large-scale climate oscillations and the corresponding teleconnection with lake water level (WL) oscillations. For this, the effect of the Southern Oscillation Index (SOI), ... -
Discharge coefficient for vertical sluice gate under submerged condition using contraction and energy loss coefficients
Vaheddoost, Babak; Safari M.J.S.; Ilkhanipour Zeynali R. (Elsevier Ltd, 2021)A novel method is suggested for the determination of flow discharge in vertical sluice gates with considerably small bias. First, in order to derive an equation for the discharge coefficient, energy-momentum equations are ... -
Drought indices and indicators revisited
Yihdego, Yohannes; Vaheddoost, Babak; Al-Weshah, Radwan A. (Springer Heidelberg, 2019)There are numerous drought indicators used by decision makers all around the globe which have been developed to fulfill specific needs. By far, risks associated with drought and related consequences have become a bold topic ... -
Ege bölgesinde akım kuraklık indeksi ve standart yağış indeksinin ortak incelenmesi
Gülmez, Ayşe (2022)Su, yeryüzündeki yaşam ve hidrolojik olaylar döngüsünün devamlılığını sağlayarak tüm canlılara hayat kaynağı olan temel bir maddedir. Dünyada atmosfer, denizler, okyanuslar ve toprak arasında sürekli bir döngüde olan su ... -
ENN-SA: A novel neuro-annealing model for multi-station drought prediction
Mehr, Ali Danandeh; Vaheddoost, Babak; Mohammadi, Babak (Pergamon-Elsevier Science Ltd, 2020)This paper presents a new hybrid model, called ENN-SA, for spatiotemporal drought prediction. In ENN-SA, an Elman neural network (ENN) is conjugated with simulated annealing (SA) optimization and support vector machine ... -
Identification of the trends associated with the SPI and SPEI indices across Ankara, Turkey
Danandeh Mehr, Ali; Vaheddoost, Babak (Springer Wien, 2020)This study investigates the main characteristics (duration, severity, and trend) of meteorological drought events over Ankara Province, Turkey. We used 46 years of observed monthly precipitation and temperature series from ... -
Interaction of groundwater with Lake Urmia in Iran
Vaheddoost, Babak; Aksoy, Hafzullah (Wiley, 2018)Being a large hyper-saline water body, Lake Urmia in north-western Iran deals with a gradual decline in its water level. Most of the studies on Lake Urmia have neglected the groundwater issue. In this study, as a direct ... -
Modeling the volatility changes in Lake Urmia water level time series
Fathian, Farshad; Vaheddoost, Babak (Springer Wien, 2020)The decline in Lake Urmia (LU) water level during the past two decades has been addressed by several studies. However, the conducted studies could not come across a practical solution by considering the sample mean in the ... -
Parametric and nonparametric regression models in study of the length of hydraulic jump after a multi-segment sharp-crested V-notch weir
Saadatnejadgharahassanlou, Hamid; Zeynali, Rasoul Ilkhanipour; Vaheddoost, Babak; Gharehbaghi, Amin (Iwa Publishing, 2020)A multi-segment sharp-crested V-notch weir (SCVW) was used both theoretically and experimentally in this study to evaluate the length of the hydraulic jump at the downstream of the weir. For this aim, a SCVW with three ... -
Reconstruction of Hydrometeorological Data in Lake Urmia Basin by Frequency Domain Analysis Using Additive Decomposition
Vaheddoost, Babak; Aksoy, Hafzullah (Springer, 2019)Frequency domain analysis using an additive decomposition method is proposed to reconstruct the missing hydrometeorological data of selected sites in Lake Urmia basin in Iran. Precipitation, evaporation, streamflow and ... -
Regressive-stochastic models for predicting water level in Lake Urmia
Vaheddoost, Babak; Aksoy, Hafzullah (Taylor and Francis Ltd., 2021)This study develops a set of models to investigate the water budget of Lake Urmia in Iran, a permanent hypersaline lake that has suffered a declining water level since the late 1990s. The models are of the regressive-stochastic ... -
A Spatiotemporal Classification of the Peruvian Precipitations Between 1990 and 2015
Vaheddoost, Babak (Springer Basel Ag, 2020)Precipitation and its variations have great importance in water resource management and sustainable development. In this study, the Peruvian precipitations between January 1990 to October 2015, were used. The precipitations ... -
A spatiotemporal teleconnection study between Peruvian precipitation and oceanic oscillations
Mohammadi, Babak; Vaheddoost, Babak; Mehr, Ali Danandeh (Pergamon-Elsevier Science Ltd, 2020)Large-scale oceanic oscillations and their teleconnections with meteorological events are of great importance in macro-scale climatic studies. In this regard, this study investigates the spatiotemporal teleconnections ... -
Temporal dynamics of monthly evaporation in Lake Urmia
Vaheddoost, Babak; Kocak, Kasim (Springer Wien, 2019)As a UNESCO biosphere, Lake Urmia is a shallow hypersaline lake which is facing a rapid water surface degradation. Evaporation from the surface of the Lake, as a physical process which accelerates the Lake's degradation, ... -
Three dimensional flow simulation over a sharp-crested V-Notch weir
Saadatnejadgharahassanlou, Hamid; Zeynali, Rasoul Ilkhanipour; Gharehbaghi, Amin; Mehdizadeh, Saeid; Vaheddoost, Babak (Elsevier Sci Ltd, 2020)Thin-plate weirs are widely used to monitor the flow rate in open channels. Thereby, three dimensional (3D) modeling of the flow over a weir in an open channel can be considered as one of the main topics in hydraulic ... -
Urmia lake water depth modeling using extreme learning machine-improved grey wolf optimizer hybrid algorithm
Sales, Ali Kozekalani; Gul, Enes; Safari, Mir Jafar Sadegh; Ghodrat Gharehbagh, Hadi; Vaheddoost, Babak (Springer, 2021)Lake water level changes are relatively sensitive to the climate-born events that rely on numerous phenomena, e.g., surface soil type, adjacent groundwater discharge, and hydrogeological situations. By incorporating the ...
