Browsing All Posts filed under »erosion«

Serious streambank erosion in farming catchments

March 25, 2018

0

Streambank erosion is influenced by a number of factors, including water movement, freeze-thaw cycles, bank drying, vegetative cover, animal trampling and agricultural practices. Studies show that bank erosion can be  responsible for a significant fraction of the sediment exported by streams and rivers.  In western Europe, where many areas of grassland have been converted to […]

Simplifying urban stream assessment

December 21, 2017

Comments Off on Simplifying urban stream assessment

Urban streams experience high levels of stormwater runoff and channel erosion, and represent a significant challenge for ecological restoration.  Nevertheless, it’s generally agreed that urban stream restoration should aim to mimic the natural (pre-development) flow regime as closely as possible.  It’s been proposed that ecologically important aspects of flow can be used as a basis […]

Lateral thinking on riverbank erosion

September 25, 2017

Comments Off on Lateral thinking on riverbank erosion

Although bank erosion is often thought of as problem that has to be addressed through engineered stabilization, the lateral migration of meandering streams is a natural mechanism that redistributes channel sediment and maintains habitat diversity. New riparian zones are formed as sediment is deposited on the inside of bends and colonised by vegetation.  Meandering creates […]

Planting vegetation to stop stream bank erosion: where’s the evidence?

June 19, 2017

Comments Off on Planting vegetation to stop stream bank erosion: where’s the evidence?

Increased rates of stream bank erosion and sediment movement in disturbed catchments have been attributed to changes in catchment hydrology caused by land clearing, channel modification, the trampling activities of livestock and the removal of riparian vegetation. Given that these effects are human-induced, it’s commonly assumed that they can also be reversed by human intervention, […]

Dealing with river complexity

March 27, 2017

Comments Off on Dealing with river complexity

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 […]

Bioengineered riverbanks

March 23, 2016

Comments Off on Bioengineered riverbanks

Streamside riparian zones support diverse and specialized plant communities and provide animal species with habitat, shelter and migratory opportunities. However, human pressures are such that measures are frequently needed to counter the problem of riverbank erosion. While bank protection has often been approached from a hard civil engineering perspective, there are ecological and aesthetic advantages […]

Stream-bed stability: differing effects of floods

December 18, 2015

Comments Off on Stream-bed stability: differing effects of floods

Floodwaters are often released from dams to rejuvenate channel form and aquatic habitats, but in the process, large volumes of sediment can be transferred downstream. Therefore, especially in the case of rivers where the sediment supply is limited, it’s useful to be able to predict how different flows affect particle mobilisation and retention. In a […]