chapter 3 fundamentals of fluvial geomorphology and stream ...

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(a) Bed and Bank InstabilityFigure 3.11 – Consequences ofSystem Instability(b) Formation of Gullies in Floodplain50 Fundamentals of Fluvial Geomorphology and Stream Processes
(b) Damage to InfrastructureFigure 3.11. (cont.) –Consequences ofSystem Instability(d) Excessive Sediment Deposition in Lower Reaches of Watershed3.7.4.1 Downstream Factors The stability of a fluvial system can be significantly affectedby changes to downstream base level. Base level refers to thedownstream limit of the stream network, the elevation of whichdefines the datum for measurement of potential energy in thesystem upstream. In sub-critical flow, the water surface elevationat the downstream limit of the stream controls the longitudinalwater surface profile for a stream. Similarly, the bed elevation atFundamentals of Fluvial Geomorphology and Stream Processes 51
Page 6 and 7: materials. Also, the threshold mobi
Page 8 and 9: ank of a large river. From an engin
Page 10 and 11: eddies in a stream do not scale on
Page 12 and 13: aiding. Braid bars are sediment fea
Page 14 and 15: Sinuosity (P) is a commonly used pa
Page 16 and 17: outcrops, other non-erodible materi
Page 18 and 19: continent (Inglis 1941, 1947, 1949)
Page 20 and 21: instances where the bankfull discha
Page 22 and 23: uses readily available mean daily f
Page 24 and 25: of flows. The results are plotted a
Page 26 and 27: Similarly, in regime theory the con
Page 28 and 29: 3.7 STREAM STABILITY ANDINSTABILITY
Page 30 and 31: It should be noted that the map coo
Page 32 and 33: and slope of the reach are not sign
Page 36 and 37: the downstream limit of the system
Page 38 and 39: dam, where degradation was expected
Page 40 and 41: Figure 3.13 - Channel PatternClassi
Page 42 and 43: definition of a graded stream in wh
Page 44 and 45: midwestern experience, while Rosgen
Page 46 and 47: Schumm et al. (1981, 1984) and thei
Page 48 and 49: ut at a much reduced rate. The sedi
Page 50 and 51: • integration of results into eng
Page 52: 68 Fundamentals of Fluvial Geomorph

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