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rivers

Figure showing channel cross section geometry and erosion potential simulated with a comprehensive morphodynamic model at different stages of the channel evolution
Posted inEditors' Highlights

Stream Hydraulic Geometry 1.01

by Valeriy Ivanov 7 December 202015 February 2023

New research provides a theoretical explanation of channel cross section geometry dependence on flow rate that is commonly observed and described with power-laws.

Six plots showing spatial distribution of steady-state groundwater aquifer salinity (colors) and flow streamlines (white) for the two-dimensional simulations of the floodplain
Posted inEditors' Highlights

Evaporation Reverses Groundwater Flow and Forms Hyper-Salinity

by D. Scott Mackay 4 December 20201 December 2022

A numerical model of groundwater-surface water systems shows how floodplain evaporation can reverse stream-groundwater flow and produce strong buoyancy changes associated with salinity.

The Colorado River flows through the Grand Canyon in northwestern Arizona.
Posted inScience Updates

Reimagining the Colorado River by Exploring Extreme Events

by K. L. Jacobs, A. McCoy, S. Martin and A. K. Gerlak 12 November 20206 January 2022

Workshops exploring environmental, social, and political scenarios to prepare for negotiating new Colorado River water management guidelines took on added realism when the COVID-19 pandemic started.

Two people on top of a boulder
Posted inNews

Powerful Glacial Floods Heave Himalayan Boulders

Katherine Kornei, Science Writer by Katherine Kornei 6 November 20206 January 2022

Many of the house-sized boulders that litter Himalayan river channels were transported thousands of years ago by glacial lake outburst floods, new observations suggest.

Aerial photo of a single boat making its way on Brazil’s São Francisco River
Posted inNews

Urbanization, Agriculture, and Mining Threaten Brazilian Rivers

by Meghie Rodrigues 27 October 20206 December 2021

Harder to analyze and quantify, diffuse pollution is often overlooked when it comes to water quality assessments.

The Alaknanda River, seen from stream level, flows among mountains in northern India.
Posted inResearch Spotlights

Tracking Trace Elements in the Ganga River

by David Shultz 16 October 202016 February 2022

Levels of dissolved trace and heavy metals, which can be toxic, are highly variable across the river basin, concentrating in urban areas with high pollution but diluted by inflow from tributaries.

A fish jumps out of the water as it heads upstream
Posted inResearch Spotlights

How River Capture Affects the Evolution of Aquatic Organisms

by David Shultz 28 September 202030 March 2023

River basins are dynamic environments that are always changing and reorganizing under geologic forces. New research investigates how this shape shifting influences aquatic speciation and extinction.

A stream in Sweden with tall green grass on either side
Posted inResearch Spotlights

Records and Risks of Legacy Phosphorus in Streams

Elizabeth Thompson by Elizabeth Thompson 23 September 202030 March 2023

A new study quantifies persistent phosphorus in a drainage basin in Sweden and points out risks and oversights to factor in to future stream management.

Historic 1902 map of Calumet Quadrangle near Chicago
Posted inNews

Chicago Wetlands Shrank by 40% During the 20th Century

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 23 September 20202 March 2023

A team of graduate students measured wetland and biodiversity changes during the 100 years following the reversal of the Chicago River.

The Huanza hydroelectric dam near Lima, Peru
Posted inResearch Spotlights

Dams Alter Nutrient Flows to Coasts

Elizabeth Thompson by Elizabeth Thompson 15 September 202022 December 2021

New models indicate how dams worldwide influence the mix of nutrients in river water reaching the ocean. As more dams are built, changing nutrient loads may adversely affect coastal ecosystems.

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