chapter 3 fundamentals of fluvial geomorphology and stream ...
chapter 3 fundamentals of fluvial geomorphology and stream ...
chapter 3 fundamentals of fluvial geomorphology and stream ...
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(b) Damage to InfrastructureFigure 3.11. (cont.) –Consequences <strong>of</strong>System Instability(d) Excessive Sediment Deposition in Lower Reaches <strong>of</strong> Watershed3.7.4.1 Down<strong>stream</strong> Factors The stability <strong>of</strong> a <strong>fluvial</strong> system can be significantly affectedby changes to down<strong>stream</strong> base level. Base level refers to thedown<strong>stream</strong> limit <strong>of</strong> the <strong>stream</strong> network, the elevation <strong>of</strong> whichdefines the datum for measurement <strong>of</strong> potential energy in thesystem up<strong>stream</strong>. In sub-critical flow, the water surface elevationat the down<strong>stream</strong> limit <strong>of</strong> the <strong>stream</strong> controls the longitudinalwater surface pr<strong>of</strong>ile for a <strong>stream</strong>. Similarly, the bed elevation atFundamentals <strong>of</strong> Fluvial Geomorphology <strong>and</strong> Stream Processes 51
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