High- and Low-sinuosity Stream Deposits, with Examples from the Devonian of Spitsbergen

Moody-Stuart, M.

doi:10.1306/74d71609-2b21-11d7-8648000102c1865d

Cited by 114 publications

(63 citation statements)

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“…The widespread occurrence of sandy facies and an absence of thick units of massive gravel is unlike facies models developed from descriptions of proximal or medial low sinuosity rivers (Williams and Rust, 1969;Rust, 1972Rust, , 1978bMiall, 1978) and the occurrence of large intraclasts and a notable gravel content renders a distal origin unlikely. The Eardington sequence shows significant differences from assemblages described from both Pleistocene (Costello and Walker, 1972;Bryant, 1983) and ancient situations (Moody-Stuart, 1966;Miall, 1976;Bluck, 1980). However, there are similarities to structures described by Campbell (1 976) in the Jurassic Morrison Formation (New Mexico), which he interpreted as being deposited by aggrading and coalescing braided streams.…”

Section: Discussionmentioning

confidence: 68%

Environmental reconstructions of a late devensian terrace sequence. Some preliminary findings

Dawson

1985

Earth Surf Processes Landf

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Facies analysis of Severn Main terrace sediments at Eardington, Shropshire is instructive in determining aspects of the sedimentary environment at a 'proximal' location in the terrace. Evaluation of the structural and directional properties of the gravels indicates that the terrace is a composite feature comprising two units. The lower unit is notable for the widespread Occurrence of large sandy facies, a near absence of massive gravel facies, and the presence of large, locally derived, lithoclasts in excess of 1 m in diameter. Facies associations observed indicate the existence of in-channel bars and large channels with bedforms at the dune-plane bed transition. The directional properties of the unit indicate flows parallel to the main valley axis and although the unit is unlike previously reported examples it is interpreted as being the product of a proximal low sinuosity environment. The upper unit is composed mainly of multistorey, coarse, massive gravel units with limited interbedded sand facies. Fabric analysis indicates progradation of the unit from the west. The facies sequence is similar to those encompassed by facies models proposed for proximal alluvial fan deposits and therefore, on structural and directional grounds, the upper unit is interpreted as an alluvial fan deposit which prograded into the main Severn valley from the adjacent Mor Brook tributary. The implications of the composite nature of the terrace at this point are considered both in terms of terrace correlation and palaeohyrological estimation.

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Section: Discussionmentioning

confidence: 68%

Environmental reconstructions of a late devensian terrace sequence. Some preliminary findings

Dawson

1985

Earth Surf Processes Landf

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“…The curvature pattern of the river reach was determined by sinuosity, which is the ratio between channel and valley lengths [44]. The threshold between straight or low sinuosity channels and meandering or high sinuosity channels was defined as 1.3 according to Moody et al (1966) [45]. We defined the lateral erosion and deposition area as the area of a polygon enclosed by successive channel bank lines between the two time intervals (Figure 4a).…”

Section: Parameters Measurementmentioning

confidence: 99%

Remotely Sensed Trajectory Analysis of Channel Migration in Lower Jingjiang Reach during the Period of 1983–2013

et al. 2015

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Abstract:In China, the Lower Jingjiang Reach (LJR) of the Yangtze River could be one of the most complicated areas in terms of channel migration. The river had undergone many channel changes in the reach since the 18th century. Intensive human activities in recent decades, such as the construction of upstream dams and revetments, had directly affected the channel migration characteristics. The revetment would significantly diminish migration, whereas the reduced sediment caused by dams would increase bank erosion and bank failure risks. Satellite imageries of Landsat Multi Spectral Scanner (MSS), Thematic Mapper (TM), Enhanced Thematic Mapper Plus (ETM+) and Operational Land Imager (OLI) were employed to quantify the planform migration of the reach from 1983 to 2013 and to investigate the possible effect of human activities on the LJR channel evolution. Apart from the commonly used planform morphometric parameters, the migration direction was introduced to predict the future migration trends. Results showed that the LJR was gradually changing to a straighter channel, with sinuosity reducing from 2.09 to 1.9 and river length decreasing from 125.32 km to 113.31 km in the past 30 years. Planform morphometric parameters, such as migration rate of the channel centerline and erosion and deposition areas and rates, also decreased drastically in the past 30 years. The migration rate of the channel centerline decreased from 31.05 m¨year´1 in 1983-1988 to 11.62 m¨year´1 in 2009-2013. The lateral erosion and deposition areas decreased from 21.32 and 25.73 km 2 in 1983-1988 to 4.83 and 5.83 km 2 in 2009-2013. All of these findings indicate that the LJR tended to be in a steady state from 1983 to 2013 and was totally controlled by the bank revetments. However, the undercutting was strengthened because of the restrictive effect of revetments on lateral migration in the LJR. Moreover, the channel migrated to the left bank with a visible tendency as the total migration area to the left bank was approximately two times that of the right bank during the period. Consequently, the left bank of the LJR should be the focus of more attention in future migrations, and bank revetments of the left bank should be kept reinforced and adjusted with the change of water and sediment conditions.

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“…The coexistence of braided and meandering rivers (e.g. Moody-Stuart 1966;Cotter 1978;Allen 1985) or streams alternately meandering and braided (Allen 1974b) is a feature of the ORS. Several of these axial systems probably occupied the floor of the Cosheston graben, separated by broad, low interfluves with immature calcretes.…”

Section: Llanstadwell Formation (Llf)mentioning

confidence: 99%

“…Schumm 1985) which facilitated high rates of bar and lower-order channel migration; and (3) the lack of vegetated levées which precluded development of anastomosed rivers sensu stricto (Smith and Smith 1980;Smith 1983Smith , 1986) whose vertically-aggrading channels are frequently confined by forested levées. (For this reason Nadon's (1994) reinterpretation of the LORS low-sinuosity stream deposits of Spitsbergen (Moody-Stuart 1966) as an anastomosed fluvial sequence seems implausible. )…”

Section: Influence Of Contemporary Vegetation Upon Cosheston Fluvial mentioning

confidence: 99%

Enigma variations: the stratigraphy, provenance, palaeoseismicity and depositional history of the Lower Old Red Sandstone Cosheston Group, south Pembrokeshire, Wales

Thomas¹,

Williams

Morrissey

et al. 2006

Geol. J.

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High- and Low-sinuosity Stream Deposits, with Examples from the Devonian of Spitsbergen

Cited by 114 publications

References 0 publications

Environmental reconstructions of a late devensian terrace sequence. Some preliminary findings

Environmental reconstructions of a late devensian terrace sequence. Some preliminary findings

Remotely Sensed Trajectory Analysis of Channel Migration in Lower Jingjiang Reach during the Period of 1983–2013

Enigma variations: the stratigraphy, provenance, palaeoseismicity and depositional history of the Lower Old Red Sandstone Cosheston Group, south Pembrokeshire, Wales

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