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A distributed hydrological model was applied to a 69km2 experimental catchment, Eddleston Water, Scotland, UK. The impact on model outputs of applying progressively simpler representations of spatial variability in land use and superficial geology was assessed. Alternative representations of the spatial distribution of superficial geology and land use produced differences in model outputs. These differences were generally small with the exception of the maximum absolute error (Emax). Inter-model differences were most sensitive to the largest precipitation events. Although variations in superficial geology dominated over those for land use, exceptions were seen in two sub-catchments. These were connected with particularly large variations in land use and/or the small spatial extent of superficial geology. Lower resolution spatial data produced superior model performance in the majority of sub-catchments. This has implications for modelling other catchments especially in situations where the high resolution data employed herein are not available.
Stanislav Ruman; Tom Ball; Andrew R. Black; Julian R. Thompson. Influence of alternative representations of land use and geology on distributed hydrological modelling results: Eddleston, Scotland. Hydrological Sciences Journal 2021, 66, 488 -502.
AMA StyleStanislav Ruman, Tom Ball, Andrew R. Black, Julian R. Thompson. Influence of alternative representations of land use and geology on distributed hydrological modelling results: Eddleston, Scotland. Hydrological Sciences Journal. 2021; 66 (3):488-502.
Chicago/Turabian StyleStanislav Ruman; Tom Ball; Andrew R. Black; Julian R. Thompson. 2021. "Influence of alternative representations of land use and geology on distributed hydrological modelling results: Eddleston, Scotland." Hydrological Sciences Journal 66, no. 3: 488-502.
This study represents the first palaeoflood discharge estimation using dendrogeomorphic evidence from two ungauged catchments in southern Crete. Dendrogeomorphological methods, rainfall-runoff and hydraulic modelling were applied to estimate the palaeoflood discharge of the 2000 flood event. We developed two scenarios (QHydraulic, QRR) of peak discharges in the short reaches of the Ilingas and Sfakia catchments. Scenario QRR was based on the results of the uncalibrated rainfall-runoff model HEC-HMS. The calculated discharges were equal to 35.9 m3 s−1 in the Ilingas reach and 7.6 m3 s−1 in the Sfakia reach. The second scenario, QHydraulic was based on the output of the two-dimensional hydraulic model IBER, which was calibrated using six palaeostage indicators obtained during a field survey. The reconstructed discharge for the QHydraulic scenario was equal to 26.3 m3 s−1 in Ilingas and 11.2 m3 s−1 in Sfakia. Deviation (26.7% in Ilingas and 32.1% in Sfakia) between the scenarios were attributed mainly to the uncertainties of in flood reconstruction using the palaeostage indicators and uncalibrated rainfall-runoff model. We further investigated uncertainty in Manning’s roughness coefficient, which caused deviations in peak discharges with the range of these deviations defined within ± 40% in the Ilingas reach and ± 36% in the Sfakia reach.
Stanislav Ruman; Radek Tichavský; Karel Šilhán; Manolis G. Grillakis. Palaeoflood discharge estimation using dendrogeomorphic methods, rainfall-runoff and hydraulic modelling—a case study from southern Crete. Natural Hazards 2020, 105, 1721 -1742.
AMA StyleStanislav Ruman, Radek Tichavský, Karel Šilhán, Manolis G. Grillakis. Palaeoflood discharge estimation using dendrogeomorphic methods, rainfall-runoff and hydraulic modelling—a case study from southern Crete. Natural Hazards. 2020; 105 (2):1721-1742.
Chicago/Turabian StyleStanislav Ruman; Radek Tichavský; Karel Šilhán; Manolis G. Grillakis. 2020. "Palaeoflood discharge estimation using dendrogeomorphic methods, rainfall-runoff and hydraulic modelling—a case study from southern Crete." Natural Hazards 105, no. 2: 1721-1742.
A hydrological model was applied to select the best infilling method of missing precipitation (1) and to assess the impact of the length of deleted and filled precipitation data (2). The model was calibrated and validated using the hourly observed discharges from two gauges located in the outlet of the catchment (62.34 km2) and in the inner sub-catchment (2.05 km2). Precipitation from four gauges was spatially interpolated over the overall catchment, while the sub-catchment used the precipitation from one gauge. Four scenarios of different lengths of deletion within three high-intensity events were established in the data of this gauge. Three infilling methods were applied and compared: substitution, linear regression and inverse distance weighting (IDW). Substitution showed the best results, followed by linear regression and IDW in both scales. Differences between methods were significant only in 8.3% and 19.4% of all cases (sub-catchment and catchment, respectively). The impact of length was assessed using the substitution only and by comparing differences in discharges and performance statistics caused by four scenarios. Higher differences in discharges were found on the catchment scale compared to the inner sub-catchment and were insignificant for all events and scenarios. The hypothesis that a longer length of deleted and filled data would lead to a greater error in discharges was wrong for 11.1% and 16.7% of all cases (sub-catchment and catchment, respectively). In several cases (33.4% sub-catchment, 27.1% catchment), the model produced better results using the time series with filled gaps compared to the configuration with observed data.
S. Ruman; P. Krpec; P. Rusnok; A. R. Black; M. Trizna; T. Ball. Impact of missing precipitation values on hydrological model output: a case study from the Eddleston Water catchment, Scotland. Acta Geophysica 2020, 68, 565 -576.
AMA StyleS. Ruman, P. Krpec, P. Rusnok, A. R. Black, M. Trizna, T. Ball. Impact of missing precipitation values on hydrological model output: a case study from the Eddleston Water catchment, Scotland. Acta Geophysica. 2020; 68 (2):565-576.
Chicago/Turabian StyleS. Ruman; P. Krpec; P. Rusnok; A. R. Black; M. Trizna; T. Ball. 2020. "Impact of missing precipitation values on hydrological model output: a case study from the Eddleston Water catchment, Scotland." Acta Geophysica 68, no. 2: 565-576.
Floods represent frequent hazards in both low- and first-order catchments; however, to date, the investigation of peak flow discharges in the latter catchments has been omitted due to the absence of gauging stations. The quantification of flood parameters in a first-order catchment (1.8 km2) was realised in the moderate relief of NE Czechia, where the last flash flood event in 2014 caused considerable damage to the infrastructure. We used an integrated approach that included the dendrogeomorphic reconstruction of past flood activity, hydraulic modelling of the 2014 flash flood parameters using a two-dimensional IBER model, and evaluation of the channel stability using sedimentological parameters. Based on 115 flood scars, we identified 13 flood events during the period of 1955 to 2018, with the strongest signals recorded in 2014, 2009 and 1977. The modelled peak flow discharge of the last 2014 flood was equal to 4.5 m3·s−1 (RMSE = 0.32 m) using 26 scars as palaeostage indicators. The excess critical unit stream power was observed at only 24.2% of the reaches, representing predominantly bedrock and fine sediments. Despite local damage during the last flood, our results suggest relatively stable geomorphic conditions and gradual development of stream channels under discharges similar to that in 2014.
Radek Tichavský; Stanislav Ruman; Tomáš Galia. Hydrogeomorphic Impacts of Floods in a First-Order Catchment: Integrated Approach Based on Dendrogeomorphic Palaeostage Indicators, 2D Hydraulic Modelling and Sedimentological Parameters. Water 2020, 12, 212 .
AMA StyleRadek Tichavský, Stanislav Ruman, Tomáš Galia. Hydrogeomorphic Impacts of Floods in a First-Order Catchment: Integrated Approach Based on Dendrogeomorphic Palaeostage Indicators, 2D Hydraulic Modelling and Sedimentological Parameters. Water. 2020; 12 (1):212.
Chicago/Turabian StyleRadek Tichavský; Stanislav Ruman; Tomáš Galia. 2020. "Hydrogeomorphic Impacts of Floods in a First-Order Catchment: Integrated Approach Based on Dendrogeomorphic Palaeostage Indicators, 2D Hydraulic Modelling and Sedimentological Parameters." Water 12, no. 1: 212.