Ivan Gabriel-Martin, Alvaro Sordo-Ward, Luis Garrote & Isabel - - PowerPoint PPT Presentation

Ivan Gabriel-Martin, Alvaro Sordo-Ward, Luis Garrote & Isabel Granados

Departamento de Ingeniería Civil: Hidráulica, Energía y Medio Ambiente

NOVEMBER-2018

3rd International Electronic Conference on Water Sciences (ECWS-3)

Introduction

Introduction Materials and Methods Results and Discussion Conclusions

• Failure of Large Dams is a concern in many countries.
• Dam risk assesment has evolved lately. Importance of

initial reservoir level.

• Evolution of stochastic methodologies.

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ECONOMIC ASSESMENT PROPOSAL STOCHASTIC METHODS DAM AND DOWNSTREAM SAFETY INITIAL RESERVOIR LEVEL

Materials and Methods

Introduction Materials and Methods Results and Discussion Conclusions

• Generation of synthetic inflow hydrographs.
• Stochastic initial reservoir level assignation.
• Reservoir-Dam system routing.
• Risk-Index analysis.

Applied to a concrete gravity multipurpose dam

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Reservoir Levels (m.a.s.l) Maximum Outflow Capacity at Maximum Normal Level (MNL) (m3/s) Maximum Normal Level (MNL) 386 Gated-spillway 2200 Design flood level (DFL) 387 Crest of dam (COD) 388 Bottom outlet 57

Results and Discussion

Introduction Materials and Methods Results and Discussion Conclusions

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200 400 600 800 0.5 1 OCT 200 400 600 800 0.5 1 NOV 200 400 600 800 0.5 1 DEC 200 400 600 800 0.5 1 JAN 200 400 600 800 0.5 1 FEB 200 400 600 800 0.5 1 MAR 200 400 600 800 0.5 1 Cumulative frequency APR 200 400 600 800 0.5 1 MAY 200 400 600 800 0.5 1 JUN 200 400 600 800 0.5 1 JUL 200 400 600 800 Initial Volume in the Reservoir (hm

3

) 0.5 1 AUG 200 400 600 800 0.5 1 SEP

500 1000 1500 2000 Maximum outflow (m

3 /s)

2 4 6 8 10 12 Damage cost (10

6 euros)

386 386.5 387 387.5 388 388.5 389 Maximum reservoir level (m.a.s.l.) 10 20 30 40 50 60 Damage cost (10

6 euros)

Hydrograph generation Damage Curves

Scenario 2 IR (103 euros) 980.5 Scenario 3 IR (103 euros) 93.0 Scenario 1 IR (103 euros) 1445.6

Initial Reservoir Level Risk Index

Conclusions

Introduction Materials and Methods Results and Discussion Conclusions

• For the case study, considering the fluctuation of initial

reservoir level provided a more realistic assessment of hydrological dam and downstream safety.

• The global risk index reduced its value up to 93 % if

variable initial reservoir level is accounted, from 1445.6 x103 to a value of 93.0 x103 euros in the case study.

4/4 The authors would like to thank the funds from Fundación José Entrecanales Ibarra in the framework of the Program “Support program for research purposes”. The authors acknowledge the computer resources and technical assistance provided by the Centro de Supercomputación y Visualización de Madrid (CeSViMa) and the funds from Universidad Politécnica de Madrid in the framework of their Program “Ayudas para contratos predoctorales para la realización del doctorado en sus escuelas, facultad, centro e institutos de I+D+i” and in the framework of their Program “Ayudas a dirigidas a jóvenes investigadores doctores para fortalecer sus planes de investigación”.

Acknowledgements

Sordo-Ward, A.; Gabriel-Martin, I.; Bianucci, P.; Garrote, L. A Parametric Flood Control Method for Dams with Gate-Controlled Spillways. Water 2017, 9, 237. https://doi.org/10.3390/w9040237

Main References

Gabriel-Martin, I.; Sordo-Ward, A.; Garrote, L.; G. Castillo, L. Influence of initial reservoir level and gate failure in dam safety analysis. Stochastic approach. J. Hydrol. 2017, 550, 669-684, https://doi.org/10.1016/j.jhydrol.2017.05.032