Difference between revisions of "Effects of water supply"

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The longitudinal profiles of Figures A to C visualize how water supply affects the main channel of a river reach. The vertical scale is exaggerated with respect to the horizontal scale. The reach can be kilometres to tens of kilometres long.
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=Effects of water supply=
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==Type==
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Diagrams of elementary morphological effects
  
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The intervention implies essentially that water is supplied continuously to the river at a certain location (A). The immediate effect is an increase in water levels along the river (B). This increase is not uniform, but varies from place to place. As a consequence, flow velocities differ from place to place too. The water levels and flow velocities can be calculated using [[1D analytical models for gradually-varied flow]] or [[1D numerical hydrodynamic models]]. The variations in flow velocity and, hence, the variations in the capacity to transport sediment give rise to a pattern of initial erosion and sedimentation along the river (B) that can be calculated using [[1D analytical models for morphology on short time scales|1D analytical models for morphology]] on short time scales or [[1D numerical morphodynamic models]]. Sedimentation over a relatively long distance occurs upstream of the intervention, whereas punctuated local erosion occurs downstream. This erosion advances downstream as a rarefaction wave. The increased flows downstream will also produce erosion in the mouth of the river.
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==Rivertypes==
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Eventually, in the long run, the river reaches a new morphological equilibrium without further trends of erosion or sedimentation (C). All bed levels and water levels have become lower than at the start of the intervention. This means that the response of the river bed is particularly complex upstream of the intervention: sedimentation on a short term but erosion on a long term.
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==Related Pressures==
  
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The longitudinal profiles in the diagrams provide a simplified picture. They do not include the response of channel width, bed sediment composition or vegetation. Nonetheless, they offer the key to understanding the relation between local pressures or measures and their effects far upstream and downstream.
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==Related Measures==
  
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Back to main pages:
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[[Tools]] or [[Diagrams of elementary morphological effects]]
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==Related Hymo quality elements==
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<Forecasterlink type="getHymoForTool" code="27" />
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==Related Biological quality elements==
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<Forecasterlink type="getBqeForTool" code="27" />
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==Related Ecosystem goods and services==
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<Forecasterlink type="getEgandsForTool" code="27" />
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==Useful references==
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==Other relevant information==
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[[Category:Tools]][[Category:Diagrams of elementary morphological effects]]

Revision as of 15:39, 9 December 2015

Factsheet: Effects of water supply

General
Category Diagrams of elementary morphological effects
River Characterisation
    Hydromorphological quality elements

    Pressures
    Measures


    Effects of water supply

    Type

    Diagrams of elementary morphological effects

    Rivertypes

      Related Pressures

      Related Measures

      Related Hymo quality elements

      Related Biological quality elements

        No Biological Quality Elements apply to this tool.

      Related Ecosystem goods and services

        No Ecosystem goods and services apply to this tool.

      Useful references

      Other relevant information

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