Effect of watershed partitioning on hydrologic parameters and estimation of hydrograph of an ungauged basin: a case study in Gokirmak and Kocanaz, Turkey

Koçyiğit, Müsteyde Baduna; Akay, Hüseyın; Yanmaz, A. Melih

doi:10.1007/s12517-017-3132-8

Cited by 18 publications

(9 citation statements)

References 28 publications

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“…It is found out from model outputs that all calibrated and validated hydrograph estimations were in acceptable range. Previous studies have shown that results obtained by modeling the whole basin as a single unit without dividing into sub basins gave improved results than using sub basins when they were evaluated according to the SI [3]. Increasing the number of sub basins would have a limited effect on peak flow, thereby resulting in some improvement in PE value.…”

Section: Discussionmentioning

confidence: 99%

“…Hence, many studies have been carried out to assess these hydrologic processes and try to relate these parameters quantitatively to the discharge. One area of such research includes the usage of hydrologic modelling software such as Precipitation Runoff Modeling System (PRMS), Hydrologic Simulation Model (HYSIM), Model for Urban Stormwater Improvement Conceptualization (MUSIC), Storm Water Management Model (SWMM), Soil and Water Assessment Tool (SWAT), MIKE -SHE and HEC-HMS which is chosen for this research [1][2][3]. In the process of hydrologic modeling of a basin, firstly calibration of hydrologic parameters are carried out using the rainfall data obtained from meteorological stations situated in or around the basin and the stream discharge values obtained from stream gaging stations for a rainfall event.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of Hydrologic Parameters of Kocanaz Watershed by a Hydrologic Model

Koçyiğit

Akay

Yanmaz

2017

International Journal of Engineering &Amp; Applied Sciences

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The main goal of this study is to estimate the hydrologic parameters of Kocanaz watershed located in Western Black Sea Region, using a semi-distributed hydrologic model, Hydrologic Engineering Center-Hydrologic Modelling System (HEC-HMS). In this study, the hydrologic model was set up for two flood events occurred in 2002 and 2013, in which one was used for calibration while the other one was used for validation of the calibrated hydrologic parameters. The watershed was introduced into the model as a single basin. Hydrologic parameters used for transformation from rainfall to runoff and base flow estimations were searched using Nelder and Mead method and calibrated using the peakweighted root mean square error. The model results were deliberated by statistical indicators such as Nash-Sutcliffe efficiency coefficient (ENS), coefficient of determination (R 2), mass balance error (MBE) and peak flow rate error (PE). The model results were found to be very good for calibration and satisfactory for validation while the peak flow rate was under estimated for both calibration and validation. It can be concluded that small watersheds such as Kocanaz might be modelled as a single basin without sacrificing the estimation capability of the model and increasing the model simulation time. Though, slightly improved peak discharge estimations were obtained in case of using sub basins.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Estimation of Hydrologic Parameters of Kocanaz Watershed by a Hydrologic Model

Koçyiğit

Akay

Yanmaz

2017

International Journal of Engineering &Amp; Applied Sciences

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“…For the distributed urban hydrological model, parameterization is a critical step before application (Sun et al, 2012), and most of the parameters are sensitive to model scale (Krebs et al, 2013). Extensive studies have shown that the sensitive parameters in urban hydrological modeling include feature width, imperviousness, the Manning coefficient, and slope (Kocyigit et al, 2017;Krebs et al, 2013). In this study, REDUS is grid based and the feature width is directly set to the grid size.…”

Section: Model Setupmentioning

confidence: 99%

Spatial Scale Effect of Surface Routing and Its Parameter Upscaling for Urban Flood Simulation Using a Grid‐Based Model

Cao

Lyu

et al. 2020

Water Resources Research

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Urban catchments are characterized by a wide variety of complex juxtapositions and surface compositions that are linked to multiple overland flow paths. Their extremely high spatial heterogeneity leads to great sensitivity of hydrologic simulation to the scale variation of calculation units. Although extensive efforts have been made for investigating the scale effects and indicate its significance, less is understood of how routing features vary with spatial scales and further how the variation of routing features influences the hydrological response. In this paper, a grid‐based distributed urban hydrological model is applied to study spatial scale effects ranging from 10 to 250 m. Two parameters are proposed to quantitatively depict the routing features of overland flow specified for impervious and pervious areas. The results show that routing features are quite sensitive to spatial resolution. Large differences among simulations exist in the infiltration amounts attributed to the combined effects of the two routing parameters, which leads to opposite effects for both total flow volume and peak flow for various rainfall events. The relationship of the key model parameters at different spatial resolutions can be explicitly expressed by corresponding routing features. With this relationship, parameters transfer among different spatial scales can be realized to obtain consistent simulation results. This study further revealed the quantitative relationship between spatial scales, routing features, and the hydrologic processes and enabled accurate and efficient simulations required by real‐time flooding forecasting and land‐atmosphere coupling, while fully taking the advantages of detailed surface information.

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“…Possible future flood discharges for ungauged basins can be estimated by transferring, regionalizing hydrologic parameters from gauged neighbouring basins or remote sensing and field measurement techniques. However, it is not recommended to use transferred or spatially distributed hydrologic parameters in the computation of design discharge as the spatial heterogeneities in the considered watershed may not be captured (Akay, Baduna Koçyiğit, & Yanmaz, 2018;Baduna Koçyiğit, Akay, & Yanmaz, 2017;Zhang et al, 2013). Unit hydrograph of a watershed can also be estimated using morphometric parameters, which can directly reflect the characteristics of a watershed.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of Scour Failure Risk of a River Bridge Located in an Ungauged Basin

Akay

2021

BJRBE

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In this study, scour failure risk of the Çatalzeytin Bridge located in the Western Black Sea Basin, Turkey, was assessed for possible future flood events and appropriate scour countermeasures were considered based on economic and constructability considerations. Waterway adequacy in the spans of the bridge and scour criticality around bridge foundations considered for risk calculations in HYRISK were estimated by hydrological and hydraulic analyses of the watershed and stream. Since the watershed of the bridge is ungauged, geomorphological instantaneous unit hydrograph concept was adopted to estimate the peak discharges with various return periods to be used in hydraulic modelling. Monte Carlo simulation results indicated that most of the simulated peak discharges were in the 95% confidence interval. Hydraulic model results from HECRAS indicated that waterway adequacy and scour criticality were critical for discharges with 200 and 500-year return periods. Scour failure risk of the Çatalzeytin Bridge was classified as high and it was proposed to reduce the risk by constructing partially grouted riprap as the most feasible alternative that would consequently increase the expected lifespan of the bridge. Following this methodology, river bridges may be prioritized based on the risk analysis.

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Effect of watershed partitioning on hydrologic parameters and estimation of hydrograph of an ungauged basin: a case study in Gokirmak and Kocanaz, Turkey

Cited by 18 publications

References 28 publications

Estimation of Hydrologic Parameters of Kocanaz Watershed by a Hydrologic Model

Estimation of Hydrologic Parameters of Kocanaz Watershed by a Hydrologic Model

Spatial Scale Effect of Surface Routing and Its Parameter Upscaling for Urban Flood Simulation Using a Grid‐Based Model

Mitigation of Scour Failure Risk of a River Bridge Located in an Ungauged Basin

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