Urban sedimentology

Douglas, Ian

doi:10.1177/030913338500900203

Cited by 15 publications

(3 citation statements)

References 43 publications

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“…Delivery of sediment into the channel network is a common consequence of urban development with potentially significant expression in the channel form. The broad relationship between stages of watershed development and resulting sediment loads have been presented in studies such as Wolman [1967], Graf [1975], and Douglas [1985;Table 1, below]. Increased sediment loads, generated at particular stages in the forest-agriculture-urban sequence of North American land development, exert an opposing tendency on the channel to that of increasing discharge and probably explain much of the channel narrowing or shallowing that is sometimes measured.…”

Section: Previous Studiesmentioning

confidence: 99%

“…Increased sediment loads, generated at particular stages in the forest-agriculture-urban sequence of North American land development, exert an opposing tendency on the channel to that of increasing discharge and probably explain much of the channel narrowing or shallowing that is sometimes measured. Douglas [1985] suggested a specific pattern of watershed development and channel response (Table 1). Simon [1989] evaluated the consequences of channelization and described a predictable evolutionary sequence of undercutting, bank failure, channel widening, and restabilization that closely resembles that of urbanization.…”

Section: Previous Studiesmentioning

confidence: 99%

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Rates of channel erosion in small urban streams

Booth

Henshaw

2001

Water Science and Application

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We address four objectives, focused on urban and urbanizing watersheds that drain forested (or once-forested) landscapes in humid regions: to document rates of channel change, to evaluate the relationship between development intensity and the rate of channel change, to evaluate geologic and topographic controls on channel change, and to determine if predevelopment conditions can be used to predict erosion-susceptible reaches. We used an 11-year data set covering 21 urban and suburban channels in western Washington, draining watersheds from 0.1 to 20 km 2 , a range that covers both seasonal and perennial channels that generally respond readily and rapidly to watershed disturbance. The results indicate:1. Rates of vertical channel change vary from below the range of measurement error (<20 mm vertical change between visits) to about 1 m (width-averaged) per year. The median rate for this sample population was 60 mm per year. 2. Within these lightly to moderately urbanized watersheds, rates of channel change did not correlate with development intensity. 3. The nature of the geologic substrate strongly influenced whether or not significant channel change occurred, but no unconsolidated substrate appears immune to change given sufficiently severe watershed disturbance. Erosion rates are independent of channel gradient within the range investigated (0.013-0.52). 4. Channels with the greatest susceptibility to rapid vertical change share the following characteristics, which can be used to predict and so reduce the consequences of future urban development on natural stream systems:  Erosion-susceptible geologic substrate;  Moderate to high gradient;  Absence of natural or artificial grade controls;  Predevelopment runoff inputs predominantly via subsurface discharge, likely to be converted to surface (point) discharge in the post-development condition.

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Section: Previous Studiesmentioning

confidence: 99%

Section: Previous Studiesmentioning

confidence: 99%

Rates of channel erosion in small urban streams

Booth

Henshaw

2001

Water Science and Application

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“…Channel sedimentation is important for the management of urban river systems (Douglas, 1985;Thoms, 1987). The impact of land disturbance activities on sediment loads and channel processes is well documented.…”

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confidence: 99%

The Impact of Urbanisation on the Bed Sediments of South Creek, New South Wales

Thoms¹,

Thiel

1995

Australian Geographical Studies

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The textural and geochemical characteristics of the bed sediments in South Creek are examined. The bed substratum in the urbanised reaches differs from that of the rural reaches, in terms of the volume and size of the fine matrix sediment and the concentration of heavy metals. The impact of urbanisation on the river‐bed sediment is variable, with less matrix than ‘expected’ within the substratum of the urban reach and more than ‘expected’ in the below urban reach. The urban matrix sediment is also significantly finer in comparison to the rural reach matrix sediment. Heavy metal concentrations within the urbanised matrix sediment are up to 800 times greater than background levels and are considered to be indicative of extreme contamination despite only SO years of urbanisation.

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The impact of tropical rainstorms on sediment and runoff generation from bare and grass-covered surfaces: a plot study from Singapore

Chatterjea

1998

Land Degrad. Dev.

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Urban sedimentology

Cited by 15 publications

References 43 publications

Rates of channel erosion in small urban streams

Rates of channel erosion in small urban streams

The Impact of Urbanisation on the Bed Sediments of South Creek, New South Wales

The impact of tropical rainstorms on sediment and runoff generation from bare and grass-covered surfaces: a plot study from Singapore

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