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Title: A study of suspended sediments and solutes from the River Don, Aberdeenshire
Author: de Oliveira Alves Coelho, Celeste
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 1979
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The aim of this study is to evaluate sediment and solute dynamics of the River Don, represented by the records collected at Parkhill, and to assess the changes brought by man's intervention upon the reach between Parkhill and Seaton. The need to make an investigation of this kind became apparent, when increasing concern was expressed about the presence of excessive suspended matter in the river. It was known that water quality was being affected. The variations in concentration of suspended solids and solutes (magnesium, calcium, sodium, potassium and conductivity) were sampled three times a day in the river Don at Parkhill station (in an agricultural area, upstream of the main industrial works) and at Seaton (downstream of the industrial works, in an urbanarea) using vacuum samplers during the period March 1976 March 1977. Twice a week sampling was conduced at Seaton, during a previous period from March 1975 to March 1976. The suspended solids discharge relationships have been evaluated and there is a tendency for maximum concentration to occur during the summer storms. Suspended solids concentration were seen to increase between 20 and 200 times, downstream of Parkhill mainly as a result of industrial pollution, road works and higher transporting capacity at Seaton in particular during the winter floods when sand-size material was beeing transported. The output of suspended matter was estimated at 33,633 tonnes/year at Parkhill and 682,979 tonnes/year at Seaton. The effects of variation in discharge upon the solutes on the River Don showed that magnesium, sodium, calcium and conductivity tended to be diluted by increase in discharge. Potassium is seen to increase with rising strearflow. The response of potassium results from its tendency to be lost from solution by abscption. Concentrations of solutes were found to increase downstream of Parkhill, during spring and summer, mainly as a result of unmeasured factors such as pollution (e.g. high suspended solids, mainly organic matter, and calcium carbonate) and nutrient cycling affect the river water chemistry. An erosion rate of 26,4 tonnes/km2 was estimated for the Don catchment. The chemical denudation was estimated at 117.7 tonnes/km2 for total dissolved solids, and 2.1 tonnes/km2 for magnesium, 11.5 tonnes/km2 for calcium, 3.1 tonnes/km2 for sodium and 1.2 tonnes/km2 for potassium. These figures were compared with others from the British Isles.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available