Browsing All Posts filed under »hydrology«

What drives regional differences in streamflow?

October 8, 2018

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Typically, large-scale models of stream flow take into account the interaction between climate and vegetation (which determines evapotranspiration) and landscape features that dictate how non-evaporated water is diverted to soil, groundwater and overland flow.  However, there are often strong spatial variations in streamflow drivers, which can limit the usefulness of global models.  Researchers drew on […]

A clearer picture of suspended sediment

October 8, 2018

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Because many pollutants adsorb onto the surfaces of fine sediment particles, sediment transport plays a central role in distributing contaminants throughout river systems.  However, current models of sediment and pollutant transfer are complex and complicated by the fact that key processes such as adsorption, erosion and deposition aren’t easily  observed.  Belgian scientists have responded to […]

Stream assessment by citizen scientists

July 5, 2018

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Although the potential spatial and temporal coverage of environmental data sets generated by citizen scientists is enormous, the quality of volunteer data sets depends on the use of simple, clearly defined and standardised methods.  To answer the need for an approach that can be used by citizen scientists to assess physical habitats and human pressures […]

How land plants control water plants

July 5, 2018

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While terrestrial ecosystems rely on rainfall infiltration for their water supply, streamside ecosystems rely on the accumulation of surface and subsurface runoff in the riparian zone and the channel network.  Rainfall that manages to percolate through the soil profile recharges aquifers, and these  sustain streamflow and riparian and aquatic ecosystems during dry periods.  Focussing on […]

Successful stream restoration can take decades

July 5, 2018

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Although assessments of the success of stream restoration projects depend on post-restoration monitoring, in most cases the monitoring period ends long before the system reaches full functional maturity.   Given this situation, it can be helpful to refer to performance curves that forecast how stream restoration projects will perform over time.  American environmental scientists set out […]

Why are there so many crocodiles in tropical waterholes?

March 26, 2018

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Transfers of organic material from one aquatic environment to another (for example, through flood pulses or animal migrations) allow productive donor ecosystems to subsidise less productive habitats. However, there are big variations in the extent to which different animal species depend on production subsidies.  To explore such differences, Australian researchers collected a wide array of […]

Aquatic plants help animal plankton to disperse

March 25, 2018

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Freshwater bodies containing aquatic plants generally support a wide range of animal plankton. If the dormant stages of zooplankton are attached to roots and the submerged parts of plants, the dislodgement and displacement of aquatic vegetation during floods could play a role in plankton dispersal. To assess this possibility, Argentinian researchers collected specimens of free-floating […]