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Development of Geomorphological Unit Hydrograph (GUH) for Ungauged Basins

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  • Aimilia-Panagiota Theochari

    (National Technical University of Athens)

  • Evangelos Baltas

    (National Technical University of Athens)

Abstract

This research work significantly advances hydrological modelling in Greece by introducing Geomorphological Unit Hydrographs (GUH) tailored for ungauged basins. These GUHs, specifically adapted to the region’s intricate geomorphology and limited data resources, provide essential insights into hydrological behaviour. Utilising an innovative approach that integrates the time-area diagram method with Python’s ArcPy module, this paper examines the geomorphological metrics of 70 drainage basins and their relationships with hydrograph characteristics. Empirical relationships, expressed through simple forms like second-order polynomials and linear equations, are established and validated across 30 basins. System analysis reveals the efficacy of the 0.1–2.0 channel velocity range, supported by positive Nash–Sutcliffe Efficiency (NSE) values. Visual representations, including histograms, elucidate the intricate connections between hydrograph attributes and geomorphological parameters. Regression analysis produces predictive equations, demonstrating strong performance with models such as T-Polynomial for Qmax and Cc-Linear for other hydrograph attributes, and their precision is confirmed through validation regression analysis, enhancing forecasting across various drainage basins.

Suggested Citation

  • Aimilia-Panagiota Theochari & Evangelos Baltas, 2025. "Development of Geomorphological Unit Hydrograph (GUH) for Ungauged Basins," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 39(4), pages 1587-1604, March.
    • Handle: RePEc:spr:waterr:v:39:y:2025:i:4:d:10.1007_s11269-024-04026-0
    DOI: 10.1007/s11269-024-04026-0
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    References listed on IDEAS

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    1. Balai Chandra Das & Aznarul Islam & Biplab Sarkar, 2022. "Drainage Basin Shape Indices to Understanding Channel Hydraulics," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 36(8), pages 2523-2547, June.
    2. B. Grum & B. A. Abebe & A. M. Degu & H. Goitom & K. Woldearegay & R. Hessel & C. J. Ritsema & V. Geissen, 2023. "Evaluation of the Velocity Parameter Estimation Methods in a Geomorphological Instantaneous Unit Hydrograph (GIUH) Model for Simulating Flood Hydrograph in Ungauged Catchments," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(1), pages 157-173, January.
    3. Anil Kumar, 2015. "Geomorphologic Instantaneous Unit Hydrograph Based Hydrologic Response Models for Ungauged Hilly Watersheds in India," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 29(3), pages 863-883, February.
    4. S. Jain & R. Singh & S. Seth, 2000. "Design Flood Estimation Using GIS Supported GIUHApproach," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 14(5), pages 369-376, October.
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