The longdendale landslides

Johnson, Richard H.; Walthall, S.

doi:10.1002/gj.3350140211

Cited by 8 publications

(2 citation statements)

References 18 publications

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“…Floodplain development may be in part associated with gradient reductions associated with valley constrictions due to extensive Holocene landsliding in the region (Johnson and Walthall, 1979;Tallis and Johnson, 1980). In the study area, regular, fine-grained, stable floodplains are present, despite the upland nature of the landscape.…”

Section: Geomorphological Context Of the Study Areamentioning

confidence: 99%

“…In the study area, regular, fine-grained, stable floodplains are present, despite the upland nature of the landscape. Floodplain development may be in part associated with gradient reductions associated with valley constrictions due to extensive Holocene landsliding in the region (Johnson and Walthall, 1979;Tallis and Johnson, 1980). Evidence for previous landslides in the specific area of investigation in this study can be observed in Figure 2, providing a reduction in gradient that has produced more lateral accommodation space for floodplain formation.…”

Section: Geomorphological Context Of the Study Areamentioning

confidence: 99%

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Geomorphological controls on fluvial carbon storage in headwater peatlands

Alderson

Evans

Rothwell

et al. 2019

Earth Surf Processes Landf

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Geomorphological controls and catchment sediment characteristics control the formation of floodplains and affect their capacity to sequester carbon. Organic carbon stored in floodplains is typically a product of pedogenic development between periods of mineral sediment deposition. However, in organically‐dominated upland catchments with a high sediment load, eroded particulate organics may also be fluvially deposited with potential for storage and/or oxidation. Understanding the redistribution of terrestrial carbon laterally, beyond the bounds of river channels is important, especially in eroding peatland systems where fluvial particulate organic carbon exports are often assumed to be oxidised. Floodplains have the potential to be both carbon cycling hotspots and areas of sequestration. Understanding of the interaction of carbon cycling and the sediment cascade through floodplain systems is limited. This paper examines the formation of highly organic floodplains downstream of heavily eroded peatlands in the Peak District, UK. Reconstruction of the history of the floodplains suggests that they have formed in response to periods of erosion of organic soils upstream. We present a novel approach to calculating a carbon stock within a floodplain, using XRF and radiograph data recorded during Itrax core scanning of sediment cores. This carbon stock is extrapolated to the catchment scale, to assess the importance of these floodplains in the storage and cycling of organic carbon in this area. The carbon stock estimate for the floodplains across the contributing catchments is between 3482‐13460 tonnes, equating on an annualised basis to 0.8‐4.5% of the modern‐day POC flux. Radiocarbon analyses of bulk organic matter in floodplain sediments revealed that a substantial proportion of organic carbon was associated with re‐deposited peat and has been used as a tool for organic matter source determination. The average age of these samples (3010 years BP) is substantially older than Infrared Stimulated Luminesence dating which demonstrated that the floodplains formed between 430 and 1060 years ago. Our data suggest that floodplains are an integral part of eroding peatland systems, acting as both significant stores of aged and eroded organic carbon and as hotspots of carbon turnover. © 2019 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd.

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Section: Geomorphological Context Of the Study Areamentioning

confidence: 99%

Section: Geomorphological Context Of the Study Areamentioning

confidence: 99%

Geomorphological controls on fluvial carbon storage in headwater peatlands

Alderson

Evans

Rothwell

et al. 2019

Earth Surf Processes Landf

View full text Add to dashboard Cite

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A non‐destructive method of determining rock strength

Allison

1988

Earth Surf Processes Landf

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Rock material strength is an important component of many geomorphological studies. Current methods for determining this parameter result in sample destruction, preventing further analysis. A new non-destructive technique is described for indirectly determining material strength, by measuring Dynamic Young's Modulus. Tests have been conducted on Jurassic Portland Limestone and Upper Cretaceous Chalk to assess the apparatus. Young's Modulus is becoming an increasingly important rock material property.

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The Cowms Rocks Landslide

Johnson

Vaughan²

1989

Geological Journal

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The Cowms Rocks landslide was the result of a translational movement which occurred downslope of a stream junction but involved part of the tributary valley side. Its morphology is described and a Gradient Index has been used to identify the component slide units. Slippage occurred on a 7° planar surface at about 40 m below the original ground surface, and consequent upon slope failure the main slump moved en masse. The tensional stresses controlling the slide were not uniform and a series of upslope‐facing escarpments developed within the main slump with some toppling and flexuring taking place at the slump's inner edge. At its margins, the slump broke into several blocks, some of which were tilted or deformed during the slip movement. The dominant factor leading to slope failure was rock (mass) creep which developed when periglacial climates prevailed in Pleistocene times. This led to differential weakening of the rocks within the slope but the exact timing for this deterioration is not known. The ultimate failure was delayed until some time in the Flandrian when stream undercutting was the ‘trigger’ mechanism.

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The longdendale landslides

Cited by 8 publications

References 18 publications

Geomorphological controls on fluvial carbon storage in headwater peatlands

Geomorphological controls on fluvial carbon storage in headwater peatlands

A non‐destructive method of determining rock strength

The Cowms Rocks Landslide

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