Dynamics of phosphorus compounds in a lowland river system: Importance of retention and non-point sources

1995 ◽  
Vol 9 (2) ◽  
pp. 119-142 ◽  
Author(s):  
Lars M. Svendsen ◽  
Brian Kronvang ◽  
Peter Kristensen ◽  
Peter Græsbøl
Keyword(s):  
River System ◽  
Point Sources ◽  
Phosphorus Compounds ◽  
Lowland River

The Environmental Impact of a Chemical Spill from a Timber-Treatment Works on a Lowland River System

1996 ◽  
Vol 10 (4) ◽  
pp. 235-244 ◽  
Author(s):  
P. Dowson ◽  
C. Chem ◽  
C. Biol ◽  
M. D. Scrimshaw ◽  
J. M. Nasir ◽  
...  
Keyword(s):  
Environmental Impact ◽  
River System ◽  
Lowland River

scholarly journals The Water Quality of the River Enborne, UK: Observations from High-Frequency Monitoring in a Rural, Lowland River System

Water ◽  
2014 ◽  
Vol 6 (1) ◽  
pp. 150-180 ◽  
Author(s):  
Sarah Halliday ◽  
Richard Skeffington ◽  
Michael Bowes ◽  
Emma Gozzard ◽  
Jonathan Newman ◽  
...  
Keyword(s):  
Water Quality ◽  
High Frequency ◽  
River System ◽  
Lowland River ◽  
Frequency Monitoring

Point sources of nutrient pollution in the lowland river catchment in the context of the Baltic Sea eutrophication

2014 ◽  
Vol 70 ◽  
pp. 337-348 ◽  
Author(s):  
Edyta Kiedrzyńska ◽  
Marcin Kiedrzyński ◽  
Magdalena Urbaniak ◽  
Artur Magnuszewski ◽  
Maciej Skłodowski ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Point Sources ◽  
Nutrient Pollution ◽  
Lowland River ◽  
The Baltic Sea ◽  
River Catchment ◽  
The Baltic

Evaluation of total nitrogen pollution reduction strategies in a river basin: a case study

2001 ◽  
Vol 44 (6) ◽  
pp. 55-62 ◽  
Author(s):  
A. Droic ◽  
J. Zagorc-Končan ◽  
M. Cotman
Keyword(s):  
Wastewater Treatment ◽  
River Basin ◽  
Total Nitrogen ◽  
Nitrogen Pollution ◽  
Point Sources ◽  
Pollution Reduction ◽  
Phosphorus Compounds ◽  
Nitrogen And Phosphorus ◽  
Nitrate Accumulation

The enrichment of groundwater and rivers by nutrients (nitrogen and phosphorus compounds) and their consequences is one of the most severe problems across Europe as well in Slovenia. Transfer of nutrients from different sources into the environment causes eutrophication of surface waters, nitrate accumulation in groundwater, and others. In this paper, the methodology of the material flow analysis is presented and applied to develop a nitrogen balance in a river basin and to evaluate different scenarios for total nitrogen pollution reduction. Application of the methodology is illustrated by means of a case study on the Krka river, Slovenia. Different scenarios are to be considered: the present level of sewerage and treatment capacities, different stages of wastewater treatment and management of agricultural activities on land. The results show that beside effluents from wastewater treatment plants, agriculture contributes significantly to the total annual nitrogen load. Beside reduction of point sources by means of wastewater collection and implementation of nutrient removal technology, managing agricultural nitrogen in order to protect river water quality and drinking water supply should become a major challenge in the Krka river basin.

Modelling nitrate from agriculture into public water supplies

1990 ◽  
Vol 329 (1255) ◽  
pp. 403-410 ◽  
Keyword(s):  
Surface Runoff ◽  
Agricultural Practices ◽  
River System ◽  
Application Rate ◽  
Point Sources ◽  
Soil Zone ◽  
Main River ◽  
Aquifer Systems ◽  
Fertilizer Application Rate ◽  
Wide Range

A wide range of models and techniques are briefly reviewed within the context of the Thames nitrates study in which models were developed to assess impacts of agricultural practices on nitrate levels in the river system. Here a semi-distributed approach was adopted in which a series of component models was developed to simulate hydrological and chemical behaviour of the Thames River basin. These components included: ( a ) a daily hydrological model for the Thames basin, which included 17 tributary sub-catchments and several major aquifer systems. The model provided input flows such as tributaries, groundwater, surface runoff, effluent returns as well as abstraction flows; ( b ) a soil zone and aquifer model for calculating the nitrate concentrations of surface runoff and groundwater given a particular land-use and fertilizer application rate; ( c ) An integrated model of flow and water quality for the main river, which provided a mass balance along 22 reaches of the main river, allowed for denitrification processes and incorporated all inputs from the non-point sources derived by ( a ) and ( b ) above. Model results will be presented together with an assessment of the major problems of nitrate modelling and predictions, which occur within the hydrologically active soil zone.

Planform deviations in river channel alignment due to active landsliding in the High Himalaya of Bhutan

2020 ◽  
Author(s):  
Larissa de Palézieux ◽  
Kerry Leith ◽  
Simon Loew
Keyword(s):  
Large Scale ◽  
Rock Slope ◽  
River System ◽  
River Channel ◽  
Point Sources ◽  
River Channels ◽  
Stream Network ◽  
Cross Sectional ◽  
Slope Instabilities

<p>Large rock slope instabilities affect river channels both due to catastrophic failures and long-term creep. The relationship between rock slop instabilities and processes in the adjacent river system are typically assessed in terms of channel profile perturbations and cross-sectional morphology, e.g. excess topography. However, such relationships can also be evident in planform changes of the channel alignment, e.g. in landslide dams and long-term channel migration. Large scale creeping rock slope instabilities can be considered point sources which introduce sediment laterally to a river channel. In cases in which sediment production from one side of the channel exceeds that of the opposing side, the course of the river can be shifted towards the less active hillslope. The deviation of the channel from its original course may therefore be used as a proxy for relative sediment input of the two opposing hillslopes.</p><p>In order to characterize the planform morphology of the river channels, we treat them as signals fluctuating around a smoothed channel and use a fast Fourier transform to extract characteristic wavelengths and amplitudes of the stream network. We observe a consistent increase in amplitude of planform deviation with increasing wavelength with a variability of two orders of magnitude at the shortest wavelength (10<sup>1</sup> m) and less than one order of magnitude at longer wavelengths (10<sup>3</sup> m).</p><p>When comparing characteristic channel morphologies based on these analyses to the deviation of channels adjacent to mapped landslides, the amplitude of the deviation appears higher than those naturally occurring in the river system at wavelengths similar to twice the landslide width.</p>

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