Tracing suspended sediment and particulate phosphorus sources in catchments

Summary Information on suspended sediment and particulate P (PP) sources is an important requirement in many catchment-based diffuse source pollution studies, in order to assist with model validation and to provide information to support the development of effective sediment and phosphorus control strategies. Such information is, however, frequently unavailable or difficult to assemble. In the study reported, source fingerprinting procedures were successfully used to assemble this information for seven sub-catchments in the Hampshire Avon catchment and five sub-catchments in the Middle Herefordshire Wye catchment. The results provide important new information on the relative importance of the contributions from surface and channel/subsurface sources to the suspended sediment and PP fluxes from the catchments. In the Wye sub-catchments channel/subsurface sources contributed 40–55% of the overall suspended sediment flux and 21–43% of the PP flux from the catchments. Equivalent values for the Avon were 1–41% and 1–54%, respectively. Combination of the information on the relative importance of surface and channel/subsurface sources with measured suspended sediment fluxes has provided the first estimates of the specific fluxes of sediment and PP attributable to channel/subsurface sources for UK catchments. The former are as high as 15–20 t km−2 year−1 in some of the Wye sub-catchments, whereas the latter exceeded 0.1 kgP ha−1 year−1 in the same sub-catchments. The results emphasize the need to take account of potential contributions from channel/subsurface sources when using measured suspended sediment and PP flux data to validate predictions derived from models incorporating only surface contributions.

[1]  R. W. Pearson.  Determination of organic phosphorus in soils. , 1940 .

[2]  D. Walling,et al.  Documenting catchment suspended sediment sources: problems, approaches and prospects , 2004 .

[3]  N. C. Mehta,et al.  Determination of Organic Phosphorus in Soils: I. Extraction Method1 , 1954 .

[4]  D. Walling,et al.  Source type ascription for fluvial suspended sediment based on a quantitative composite fingerprinting technique , 1997 .

[5]  Ian D L Foster,et al.  Tracers in geomorphology , 2000 .

[6]  Paul J. A. Withers,et al.  PSYCHIC – A process-based model of phosphorus and sediment mobilisation and delivery within agricultural catchments. Part 1: Model description and parameterisation , 2008 .

[7]  R. Loughran.  The measurement of soil erosion , 1989 .

[8]  D. Walling,et al.  Appraisal of a simple sampling device for collecting time-integrated fluvial suspended sediment samples , 2000 .

[9]  I. H. Rorison,et al.  Chemical Analysis of Ecological Materials. , 1974 .

[10]  A. B. Hald,et al.  Hydromorphological and biological factors influencing sediment and phosphorus loss via bank erosion in small lowland rural streams in Denmark , 2003 .

[11]  D. Walling,et al.  Selecting fingerprint properties for discriminating potential suspended sediment sources in river basins , 2002 .

[12]  D. Walling,et al.  USE OF COMPOSITE FINGERPRINTS TO DETERMINE THE PROVENANCE OF THE CONTEMPORARY SUSPENDED SEDIMENT LOAD TRANSPORTED BY RIVERS , 1998 .

[13]  D. Walling.  Tracing suspended sediment sources in catchments and river systems. , 2005, The Science of the total environment.

[14]  H. Jarvie,et al.  Influence of rural land use on streamwater nutrients and their ecological significance , 2008 .

[15]  D. Walling,et al.  Time-integrated sampling of fluvial suspended sediment: a simple methodology for small catchments , 2000 .

[16]  Desmond E. Walling,et al.  Fingerprinting suspended sediment sources in the catchment of the River Ouse, Yorkshire, UK , 1999 .

[17]  S. Franks,et al.  Quantitative sediment fingerprinting using a Bayesian uncertainty estimation framework , 2002 .

[18]  D. Coote,et al.  Topography and water erosion in northern Shaanxi Province, China , 1993 .

[19]  A. Nicholas,et al.  A multi-parameter approach to fingerprinting suspended-sediment sources , 1993 .

[20]  D. Walling,et al.  Tracing sources of suspended sediment in river basins: A case study of the River Culm, Devon, UK , 1995 .

[21]  D. Walling,et al.  Storage of fine-grained sediment and associated contaminants within the channels of lowland permeable catchments in the UK , 2005 .

[22]  D. Walling,et al.  Composite fingerprinting of the spatial source of fluvial suspended sediment : a case study of the Exe and Severn river basins, United Kingdom , 1996 .

[23]  L. M. Svendsen,et al.  Dynamics of phosphorus compounds in a lowland river system: Importance of retention and non‐point sources , 1995 .

[24]  Janet Hooke,et al.  Use of terrestrial photogrammetry for monitoring and measuring bank erosion , 1997 .

[25]  A. Vrieling.  Satellite remote sensing for water erosion assessment: A review , 2006 .

[26]  D. Walling,et al.  Suspended sediment sources in two small lowland agricultural catchments in the UK , 2001 .

[27]  Richard D. Hey,et al.  Applied fluvial geomorphology for river engineering and management. , 1997 .

[28]  I. Foster,et al.  Sediment and water quality in river catchments , 1995 .

[29]  Robert G. Bryant,et al.  Quantifying geomorphic and riparian land cover changes either side of a large flood event using airborne remote sensing: River Tay, Scotland , 1999 .

[30]  W. Froehlich.  Sediment delivery model for the Homerka drainage basin , 1986 .

[31]  D. Walling,et al.  Use of radiometric fingerprints to derive information on suspended sediment sources , 1992 .

[32]  D. Walling,et al.  Techniques for establishing suspended sediment sources in two drainage basins in Devon, UK: a comparative assessment , 1988 .