Temporal changes and flow pattern analysis using Colwell indices in mountainous rivers

Mostafazadeh, Raoof; Khiavi, Ali Nasiri; Ghabelnezam, Elnaz

doi:10.1007/s10668-023-03033-2

Cited by 2 publications

(2 citation statements)

References 50 publications

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“…According to a study by (Diakakis 2017) in Greece, the eastern parts had the most oods in the fall. The results of (Mostafazadeh et al 2023) showed that the reliability of climatic events has been disturbed in recent decades and the intense ow pulses had increased over time, which con rmed the occurrence of destructive Also, the evaluation of average values of the seasonal index showed that Pol-e-Soltani station had the lowest and Nair station had the highest amount of seasonal ow in the study area. The analysis of ow seasonality and its relationship with ood occurrences has been con rmed in On the other hand, the decrease in the frequency of spring oods in the eastern part of Ardabil Province can be related to the precipitation system from the Caspian Sea.…”

Section: Resultsmentioning

confidence: 74%

“…The seasons of winter, summer and autumn, with a slight difference, have allocated a part of these oods in each river gauge station. The signi cant trend of decreasing the average of the studied components showed that in the long term, the average values of the components had undergone many changes, and unfortunately, these changes have been in the form of a decrease, which has had a negative effect on the water resources of the province (Mostafazadeh et al 2023).…”

Section: Resultsmentioning

confidence: 99%

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Iso-severity flood hazard patterns in diverse relief and climatic regions to support flood management

Mostafazadeh

Khiavi

2023

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Floods are one of the most devastating natural events that threaten social and economic conditions more than any other natural disaster. Therefore, the aim of this study was to map the Iso-severity flood patterns and determining the seasonality of flood events over different return periods in in Ardabil province, Iran with diverse relief and climatic regions. Thus, the data of 32 River Gauge Stations (RGS) were used in the spatiotemporal analysis in a 40-year recorded period. EasyFit software was used to determine the most appropriate statistical distribution for the discharge data at 2-, 5-, 10-, 25-, 50- and 100-year return periods. Then, the frequency of monthly and seasonal flood events was quantified in each RGS. Then, the significant trend of flood frequency in each RGS was tested, and the seasonality of flood events was explored. According to the results, it can be said that in the studied RGS, about 63.63% of the floods are occurred in April. On the other hand, the seasonality of flood events showed that the maximum number and percentage of flood events are assigned to spring season over different return periods. As in some stations such as Yamchi, Nouran, Naneh-Karan, Mashiran, Amouqin, Doroud and Pole- Almas, almost 100% of the floods are related to spring and this shows that the floods in Ardabil province are spring floods. Iso-severity flood mapping in different return periods showed that the frequency of floods was higher than the central and northern regions in the southern and highlands of the study area. It is necessary for the southern and Iso-severity flood areas of the province, while conducting the necessary studies, proper planning should be considered with the focus on Integrated Watershed Management (IWM) in order to reduce the flood occurrence in the future and minimize its human and economic losses.

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Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Iso-severity flood hazard patterns in diverse relief and climatic regions to support flood management

Mostafazadeh

Khiavi

2023

Preprint

Self Cite

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Effects of Forest Logging Systems on the River Flow Regime Indices Using Graphical Techniques: A Case Study in a Small Natural Forest

Keivan Behjou,

Mostafazadeh,

Alaei

2024

Hydrology

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This study aims to investigate the impact of forest exploitation methods on monthly discharge and hydrological indices of river flow using graphical methods in a forested watershed in North Iran. To achieve this, 10 hydrological index changes related to river flow regime influenced by the Shelterwood/clear cutting, Femel cutting, and the Near Nature approach forest cutting methods were assessed. According to the results, it can be stated that the Shelterwood/clear cutting method influenced monthly flow indices by increasing the coefficient of variations and intensifying runoff production, while the Femel cutting and the Near Nature approach methods contributed to regulating the flow regime and sustaining river flow. The influence of various tree-cutting techniques on river flow values and fluctuations is more evident during the wettest months compared to low-water months. The period of Shelterwood/clear cutting disrupted the natural correlation between precipitation and runoff production. Furthermore, the shift from Shelterwood/clear cutting to Femel cutting and the Near Nature approach progressively diminished the slope of the curve, indicating a reduction in monthly runoff at both measurement stations. In conclusion, opting for an appropriate method, such as the Near Nature approach, is preferable from both ecological and hydrological perspectives when managing forest areas in the study region and similar conditions involving comparable topography, climate, soil, and forest stands. The index-based coupled with graphical methodology employed appropriately demonstrates the influence of logging techniques on monthly flow patterns, which provides valuable insights into evaluating the repercussions of alternative management interventions on river flow dynamics.

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Temporal changes and flow pattern analysis using Colwell indices in mountainous rivers

Cited by 2 publications

References 50 publications

Iso-severity flood hazard patterns in diverse relief and climatic regions to support flood management

Iso-severity flood hazard patterns in diverse relief and climatic regions to support flood management

Effects of Forest Logging Systems on the River Flow Regime Indices Using Graphical Techniques: A Case Study in a Small Natural Forest

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