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Article

Generating Regional Models for Estimating the Peak Flows and Environmental Flows Magnitude for the Bulgarian-Greek Rhodope Mountain Range Torrential Watersheds

1
School of Forestry and Natural Environment, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
2
Space Research and Technology Institute—Bulgarian Academy of Sciences, Department of Aerospace Information, Sofia 1113, Bulgaria
*
Author to whom correspondence should be addressed.
Water 2020, 12(3), 784; https://doi.org/10.3390/w12030784
Received: 14 February 2020 / Revised: 5 March 2020 / Accepted: 10 March 2020 / Published: 12 March 2020
The flood magnitudes with 25, 50, and 100 years return periods and the environmental flows (Qenv) are of outmost importance in the context of hydraulic and hydrologic design. In this study, 25 watershed characteristics were linked with the aforementioned recurrence intervals, peak discharge values, as well as Qenv for 15 pristine torrential watersheds with more than 10 years of streamflow records in the Rhodopi mountain range with a view to generating regional relationships for the assessment of discharge annual peaks and environmental flows regarding the ungauged torrential watersheds in the region. The Log-Pearson Type III probability distribution was fitted in the discharge annual peaks time series, so as to predict Q25, Q50, and Q100, whereas the Tennant method was utilised so as to estimate the environmental flows magnitude. Similarly, the Kolmogorov–Smirnov and the Anderson–Darling tests were performed to verify the distribution fitting. The Principal Components Analysis method reduced the explanatory variables number to 14, whilst the stepwise multiple regression analysis indicated that the exponential model is suitable for predicting the Q25, the power model best forecasted the Q50 and Q100, whereas the linear model is appropriate for Qenv prognosis. In addition, the reliability of the obtained regression models was evaluated by employing the R2, the Nash–Sutcliffe efficiency, and the Index of Agreement Statistical Criteria, which were found to range from 0.91–0.96, 0.88–0.95 and 0.97–0.99, respectively, thereby denoting very strong and accurate forecasts by the generated equations. Thus, the developed equations could successfully predict the peak discharge values and environmental flows within the region’s ungauged watersheds with the drainage size not exceeding 330 km2. View Full-Text
Keywords: peak flows; environmental flows; principal components analysis; stepwise regression; Log-Pearson type III; Rhodopi mountain range peak flows; environmental flows; principal components analysis; stepwise regression; Log-Pearson type III; Rhodopi mountain range
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MDPI and ACS Style

Myronidis, D.; Ivanova, E. Generating Regional Models for Estimating the Peak Flows and Environmental Flows Magnitude for the Bulgarian-Greek Rhodope Mountain Range Torrential Watersheds. Water 2020, 12, 784. https://doi.org/10.3390/w12030784

AMA Style

Myronidis D, Ivanova E. Generating Regional Models for Estimating the Peak Flows and Environmental Flows Magnitude for the Bulgarian-Greek Rhodope Mountain Range Torrential Watersheds. Water. 2020; 12(3):784. https://doi.org/10.3390/w12030784

Chicago/Turabian Style

Myronidis, Dimitrios, and Ekaterina Ivanova. 2020. "Generating Regional Models for Estimating the Peak Flows and Environmental Flows Magnitude for the Bulgarian-Greek Rhodope Mountain Range Torrential Watersheds" Water 12, no. 3: 784. https://doi.org/10.3390/w12030784

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