The influence of vegetation and organic debris on flood-plain sediment dynamics: case study of a low-order stream in the New Forest, England

Jeffries, Richard; Darby, Stephen E.; Sear, David

doi:10.1016/s0169-555x(02)00325-2

Cited by 165 publications

(157 citation statements)

References 50 publications

Supporting

Mentioning

150

Contrasting

Unclassified

Order By: Relevance

“…Dead or living pieces of wood can exert a tremendous influence on river erosion and sedimentation processes (e.g., Jeffries et al, 2003), channel morphology (e.g., Abbe and Montgomery, 2003), and channel hydraulics (e.g., Wallerstein et al, 2001). Wood has also been found to play a key role in the ecological diversity of river channels (Gurnell et al, 2002) by providing habitat for a range of fish and other riverine fauna and by regulating water temperatures, water turbulence, and nutrient fluxes (e.g., Van der Nat et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Tracking log displacement during floods in the Tagliamento River using RFID and GPS tracker devices

Ravazzolo¹,

Mao²,

Picco³

et al. 2015

Geomorphology

View full text Add to dashboard Cite

Large pieces of in-channel wood can exert an important role on the ecological and morphological properties of gravel-bed rivers. On the other side, when transported during flood events, large wood can become a source of risk for sensitive structures such as bridges. However, wood displacement and velocity in river systems are still poorly understood, especially in large gravel-bed rivers. This study focuses on log transport in a valley reach of Tagliamento River (Italy). Log displacement during flood events of different magnitude recorded from June 2010 to October 2011 have been analysed thanks to the installation of 113 radio frequency identification (RFID) tags and 42 GPS tracker devices in logs of different dimensions. Recovery rate of logs equipped with RFID and GPS trackers was about 43% and 42%, respectively. The GPS devices allowed us to analyse in details the log displacement and transport overtime, indicating a higher log entrainment during rising limb of hydrographs. The threshold for the entrainment of logs from low bars is around 40% of bankfull water stage. No clear relationship was found between the peak of flood and log displacement length and velocity. However, log displacement length and velocity appears significantly correlated to the ratio between the peak of flow and the water stage exceeding the flow duration curve for 25% of *Revised manuscript with no changes marked Click here to view linked References

show abstract

Section: Introductionmentioning

confidence: 99%

Tracking log displacement during floods in the Tagliamento River using RFID and GPS tracker devices

Ravazzolo¹,

Mao²,

Picco³

et al. 2015

Geomorphology

View full text Add to dashboard Cite

show abstract

“…There are many potentially important flow processes active on a floodplain, such as floodplain channels and ditches providing flow connections (Nicholas and Mitchell, 2003) as well as barriers such as embankments, floodplain channel levees and woody debris blocking flow connections (Jeffiries et al, 2003). If a model lacks sufficient detail in the topography data used to represent the floodplain, many of these connection details of the floodplain system can be missing (Trigg et al, 2012) and this commonly leads models having difficulties in filling and draining the floodplain at the correct point in the flood cycle Neal et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Surface water connectivity dynamics of a large scale extreme flood

Trigg

Michaelides

Neal

et al. 2013

Journal of Hydrology

View full text Add to dashboard Cite

During flood inundation, river water passes from the main channel into the floodplain through floodplain channels and diffusive overbank flow. This flood water is then distributed within the floodplain depending upon internal connections, barriers and storage, and finally returns back to the river through drainage connections. This surface water connectivity can be complex and is important to many aspects of floodplain functioning, including ecology, sediment movement and flood risk. However, there is currently no accepted way of quantifying this connectivity objectively. We quantify surface water connectivity geostatistically as an objectively measurable characteristic of an observed flood event using a time series of MODIS (Moderate Resolution Imaging Spectroradiometer) surface water product for an extreme large scale flood event (11,000 km 2 flooded area and 6 month duration) during 2011 in Bangkok, Thailand. We develop and apply a new gap filling method that better preserves the dynamic information of the event than simple aggregation methods. Comparison of MODIS results with the higher resolution Earth Observer 1 shows fundamental differences in the resolved connectivity with scale despite similar flooded area. The effect of the passage of the flood wave is directly observable in the river reach, as out-of-bank flooding progresses and increases connectivity along the river during rising water. Around peak flow, there is an increase in connectivity of the floodplain adjacent to the river as low lying areas fill. A step increase in connectivity is correlated with a major levee breach. During recession there is a rapid reduction in along river connectivity in the first week after the peak. This rapid reduction contrasted with a slow decrease in the floodplain connectivity as flooded depressions gradually drained reducing depth, while flood extent remained static for long periods. The connectivity analysis of the threshold in floodplain draining indicates that although spatial flood extent changes are small at this time, there is a reorganisation of the internal surface water connectivity within the flooded area. Thus through this measure of connectivity, we can see a clear structure to the event progression with new insights into flood dynamics that were not anticipated a priori.

show abstract

“…At catchment scale, topographical gradient and catchment area have key roles on controlling deep groundwater flows (Toth, 1963;Winter, 1998;Wörman et al, 2006;Jencso and McGlynn, 2011), overland flow, meso-scale topography (landforms and river planforms: Section 4), and small-scale topography (roughness on the order of cm to m: Section 5) (Sawyer et al, 2015, 10 Caruso et al, 2016. Consequentially, the spatial complexity of HEF at smaller scales is not only linked to the geomorphological characteristic of the reach and valley, but also the topographical structure of the whole catchment.…”

Section: Topographical Factorsmentioning

confidence: 99%

“…Spectral analysis has demonstrated the fractal nature of land topography and the associated fractal distribution of recharge and discharge areas and of subsurface flows (Wörman et al, 2006. Therefore, head variations due to surface topography are often used as indicators of subsurface flow (Wörman et al, 2006;Jencso et al, 2009;Jencso andMcGlynn, 2011, Caruso et al, 2016). Recent publications have shown how surface topography and the complexity of the water table induce spatial variations in groundwater discharge, 20 which in turns drive spatial variation of HEF at smaller scales (Caruso et al, 2016), and add further complexities to the heterogeneous distribution of subsurface flows as consequence of geographic, geologic and hydrologic conditions (Gleeson et al, 2016).…”

Section: Topographical Factorsmentioning

confidence: 99%

“…Wood within valleys and stream channels drives physical complexity of the river network, leading to temporal and spatial changes of channel-floodplain connectivity, stream morphology, sediment storage and flow (Piégay and Gurnell, 1997;McHenry et al, 1998;Mutz et al, 2000;Sear et al, 2000;Jeffries et al, 2003;Phillips, 2012;Davidson and Eaton, 2013). …”

Section: Wood Deliverymentioning

confidence: 99%

See 1 more Smart Citation

Scaling down hyporheic exchange flows: from catchments to reaches

Magliozzi

Grabowski

Packman

et al. 2017

Preprint

View full text Add to dashboard Cite

Abstract. Rivers are not isolated systems but continuously interact with the subsurface from upstream to downstream. In the last few decades, research on the hyporheic zone (HZ) from many perspectives has increased appreciation of the hydrological importance and ecological significance of connected river and groundwater systems. Although recent reviews, 10 modelling and field studies have explored hydrological, biogeochemical and ecohydrological processes in the HZ at relatively small scales (bedforms to reaches), a comprehensive understanding of the factors driving the hyporheic exchange flows (HEF) at larger scales is still missing. To date, there is fragmentary information on how hydroclimatic, hydrogeologic, topographic, anthropogenic and ecological factors interact to drive hyporheic exchange flows at large scales. Further evidence is needed to link hyporheic exchange flows across scales. This review aims to conceptualize interacting factors at catchment, 15 valley and reach scales that control spatial and temporal variations in hyporheic exchange flows. The implications of these drivers are discussed for each scale, and co-occurrences across scale are highlighted in a case of study. By using a multi-scale perspective, this review connects field observations and modelling studies to identify broad and general patterns of HEF in different catchments. This multi-scale perspective is useful to devise approaches to interpret hyporheic exchange across multiscale heterogeneities, to infer scaling relationships, and to inform watershed management decisions. 20

show abstract

The influence of vegetation and organic debris on flood-plain sediment dynamics: case study of a low-order stream in the New Forest, England

Cited by 165 publications

References 50 publications

Tracking log displacement during floods in the Tagliamento River using RFID and GPS tracker devices

Tracking log displacement during floods in the Tagliamento River using RFID and GPS tracker devices

Surface water connectivity dynamics of a large scale extreme flood

Scaling down hyporheic exchange flows: from catchments to reaches

Contact Info

Product

Resources

About