Browsing All Posts filed under »sediment«

Dealing with river complexity

March 27, 2017

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Hydromorphology is a relatively new field that deals with the structure of hydrological systems and changes in their form over time. Many such changes are influenced by human-induced pressures. Realistic attempts to conceptualize hydromorphological forms and processes reflect the fact that rivers are complex multidimensional systems with longitudinal, lateral, vertical and temporal components, as well […]

Emergent wetland plants as conduits for methane

December 13, 2016

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Wetlands release more methane to the atmosphere than other any other type of ecosystem and wetland plants, especially those in the shallow fringing zones, play an important role in methane dynamics. However, aquatic plants can be damaged by the grazing activities of herbivorous animals. To examine the impacts of grazing damage on the release of […]

Advantages of rough wetland designs

June 1, 2016

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In natural wetlands, the unevenness of the ground creates variation in environmental factors such as soil moisture and temperature, and this variability is a positive influence on the range of plant species that are able to colonise the area. As they become established, plants such as sedges and rushes slowly create tussocks, which further increase […]

How environmentally-damaging are run-of-river hydropower systems?

June 1, 2016

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Hydropower generation typically involves the creation of large dams for the storage and release of water, which can have serious adverse effects on riverine environments. However, growing pressures on governments to meet renewable energy targets have stimulated interest in small-scale hydropower systems, especially run-of-river schemes, which use the flow within a river channel and operate […]

Constructed wetlands can boost functional diversity

March 23, 2016

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The success of freshwater restoration projects has typically been assessed by reference to structural ecosystem features, such as water quality and species diversity. To date, indicators of ecosystem function have seldom been used for restoration assessment, but this situation is likely to change with the growing recognition that ecosystem processes are reflected in the biological […]

Waterbird numbers & fertilizer use

March 23, 2016

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Nutrients applied as fertiliser to farmland leach into rivers and streams and are transported to coastal waters, where concentrations of nitrogen and phosphorus are now respectively ten and three times higher than in pre-industrial times. While moderate rises in nutrient availability can have beneficial impacts on aquatic production, excessive nutrient levels lead to the eutrophication […]

Do pollutants bar amphibians from stormwater ponds?

December 18, 2015

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Because of the complex array of ecologically threatening processes in urban environments, our understanding of the role that artificial ponds play in allowing aquatic populations to persist in towns and cities is quite limited. Together with green roofs, swales and stream buffers, stormwater ponds are key instruments in runoff management, but by retaining sediment as […]