Experimental repetitions and blockage of large stems at ogee crested spillways with piers

Furlan, Paloma (Laboratory of Hydraulic Constructions (LCH) - École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland ; CERIS, Instituto Superior Técnico – Universidade de Lisboa, Lisboa, Portugal) ; Pfister, Michael (Laboratory of Hydraulic Constructions (LCH) - École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland ; School of Engineering and Architecture (HEIA-FR), HES-SO // University of Applied Sciences Western Switzerland) ; Matos, Jorge (CERIS, Instituto Superior Técnico – Universidade de Lisboa, Lisboa, Portugal) ; Amado, Conceição (CEMAT, Instituto Superior Técnico – Universidade de Lisboa, Lisboa, Portugal) ; Schleiss, Anton (Laboratory of Hydraulic Constructions (LCH) - École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland)

Large wood is often transported by rivers into reservoirs during heavy rainfall events. When a critical section like a spillway is blocked and discharge capacity reduced, an uncontrolled increase of the reservoir water level may occur. This study aims to statistically analyse the importance of repetitions for the accuracy of experimental campaigns when studying blocking probabilities at ogee crested spillways equipped with piers. Systematic and reliable estimations based on physical models are critical for developing preventive measures against large wood blockage. Two statistical methods have been described and applied to calculate confidence intervals. A minimum number of repetitions for a maximum acceptable error is recommended for blocking probabilities. The minimum number of experimental repetitions has been statistically justified in accordance with a reasonable use of resources for experimental campaigns. In addition, a maximum acceptable level of error is proposed as a common metric of accuracy in large wood studies.


Keywords:
Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
HEIA-FR
Institute:
iTEC - Institut des technologies de l'environnement construit
Subject(s):
Ingénierie
Date:
2018-07
Pagination:
13 p.
Published in:
Journal of Hydraulic Research
Numeration (vol. no.):
2018
DOI:
ISSN:
0022-1686
Appears in Collection:

Note: The status of this file is: public


 Record created 2018-10-02, last modified 2019-03-26

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