Weir management as structural measures for flood reduction
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WEIR MANAGEMENT AS STRUCTURAL MEASURES FOR FLOOD REDUCTION PowerPoint PPT Presentation


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WEIR MANAGEMENT AS STRUCTURAL MEASURES FOR FLOOD REDUCTION. TEAM 5 2010. Contents. I.Introduction What is weir? Weir formulas? II.Approaches Research Based Approach Modelling Based Approach III.Conclusion. Introduction. Weir -

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WEIR MANAGEMENT AS STRUCTURAL MEASURES FOR FLOOD REDUCTION

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WEIR MANAGEMENT AS STRUCTURAL MEASURES FOR FLOOD REDUCTION

TEAM 5 2010


Contents

I.Introduction

What is weir? Weir formulas?

II.Approaches

Research Based Approach

Modelling Based Approach

III.Conclusion


Introduction

Weir -

Small overflow-type dam generally used to increase the level of a river or stream.


Weir Formula (for Mike 11)

I. Villemonte (Villemonte, 1947) formula for sharp crested weirs


Weir Formula

II. Honma formula (we use this)

III. Extended Honma formula


Weir Formulas (for ISIS)

Dry Mode

Q = 0

Free Flow (we use this for ISIS)

Drowned Flow

Round Nosed Broad Crested Weir (free flow)


Research Based Approach

1st Solution – Cut Off the Crest

High Overflow


Research Based Approach

2nd Solution – Adding Geotextile

High Overflow


Research Based Approach

3rd Solution – Automated Gate


Modelling approach

  • Define objectives

    • Reduce downstream flooding

    • Find optimal heights for sediment equilibrium

  • Calibrate MIKE11 against observed levels

  • Build same model in ISIS

  • Compare results using ‘multi-model approach’


Multi-model approach

  • Model is the sum of the experience of the person who wrote the code


Reduce downstream flooding

  • No changes


Reduce downstream flooding

  • Downstream weir removed


Reduce downstream flooding

  • Four downstream weirs removed (1, 4, 5, 6)


Reduce downstream flooding

  • Weirs removed and manning’s reduced


Sediment transport

Meyer-Peter formula

qsrelated to q, s0, d50

steady-state model

  • Mean flow depth

  • Mean channel width

  • Mean velocity

  • Channel Slope

  • Particle diameter d50

http://ponce.sdsu.edu/onlinemeyerpeter.php


Sediment transport

  • Results


Conclusions

  • MIKE11 results more sensitive to weir removal

  • Cannot conclude on effectiveness of weir removal due to model disagreement

  • Reduction of channel roughness better

  • Proposals:

    • Vegetation clearance downstream

    • Alteration of weirs to improve sediment regime


Kim - our hydrological analysis expert

Sean and Ahmed who persistently work on Mike 11 and ISIS


Alex – Partially involved to Mike 11 and Hydrological Analysis.

Our report maker.

Stephane – our GIS expert


Fazlul is working on Mike 11 and ISIS

Prima and Rajmund are working on Mike SHE report


Amandine – our hydrological analysist & web designer


Acknowledgment

Prof. Dr.-Ing. habil Klaus-Peter Holz as team 5 supervisor and his patience for assisting us during Hydroeurope 2010


References

Wikipedia (2010). Weir. Wikipedia Foundation, Inc. http://en.wikipedia.org/wiki/Weir

White, Frank (2006). Fluid Mechanics. Mcgraw-Hill Education

Villemonte, James R. 1947. Submerged-Weir Discharge Studies, Engineering News. 1943. Engineering News Record, pp. 118-120. Record, pp. 54-57


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