New global dam and river data leads to advanced assessment of impacts of dams from 1930-2030
When dams are built they have an impact not only on the flow of water in the river, but also on the people who live downstream and on the surrounding ecosystems. By placing data from close to 6,500 existing large dams on a highly precise map of the world’s rivers, an international team led by McGill University researchers has created a new method to estimate the global impacts of dams on river flow and fragmentation.
Among their findings, published online today in Environmental Research Letters: 48% of the world’s river volume is moderately or severely affected by dams today – and that figure would nearly double if all dams planned or under construction are completed in the future.
“Over the past 60 years, a myriad of dams have been built either to provide hydroelectric power, or for irrigation purposes, or as flood protection,” says Bernhard Lehner, a professor in McGill University’s Department of Geography and the research director of the project. “The construction of large dams then slowed down for the last 20 years as we became more aware of their negative effects on people and ecosystems. But now, with fears about how climate change may affect water flows in the future, the goal of creating reservoirs is once more appealing, and dam construction is on the rise.”
The new research was made possible by the team’s development of a global river map with unprecedented resolution and detail, showing all waterways of the world from small creeks to the largest of rivers, accounting for a cumulative river length of 48.3 million km — and by a new map of future dam locations assembled by colleagues at the Leibniz-Institute of Freshwater Ecology and Inland Fisheries in Berlin.
The key components of the team’s dam assessment method are two indices that describe river fragmentation and river regulation.
Read more: Better dam planning strategies
The Latest on: Dam planning strategies
via Google News
The Latest on: Dam planning strategies
- Tasmania races ahead as net zero target to become lawon October 12, 2021 at 12:00 pm
THE Gutwein government will pass legislation to enshrine net-zero carbon emissions in law from 2030 onwards – making Tasmania the first Australian state to take such bold and immediate action to ...
- Carnavale Resources soil sampling identifies five new nickel-copper anomalies at Grey Damon October 11, 2021 at 10:22 pm
The aim of the UFF soil sampling program is to define geochemical anomalism that can help Carnavale economically vector into target ...
- Building resilience to compound hazard riskson October 7, 2021 at 5:00 pm
Dr. Won Min Sohn, Assistant Professor, Landscape Architecture, School of Planning, Design, and Construction, Michigan State University ...
- Rodman opponents ready to gamble again that FL will finally free the Ocklawahaon October 7, 2021 at 4:00 am
Do you play the lottery? I’ve been known to purchase a ticket or two when the payoff gets enough zeroes. The fact that I am still writing for a living should tell you how good I am at picking numbers.
- Collaborative Partners Present Chadakoin River Basin Planon October 7, 2021 at 2:29 am
A plan has been created to activate the Chadakoin River from McCrea Point Park to the Warner Dam near the National Comedy Center. On Tuesday, officials from several different entities led a tour of ...
- Warragamba Dam wall-raising proposal impact statement releasedon October 6, 2021 at 5:00 pm
The documents encompass everything from the flood mitigation benefits and biodiversity impacts, to affects to Indigenous sites and construction plans.
- Seattle City Light fights off lawsuits involving crucial hydroelectric dams, endangered salmonon October 5, 2021 at 5:13 am
With Seattle City Light (SCL) in the process of relicensing its Skagit River dams, it has been slapped with lawsuits which contend that their concrete barriers have stopped chinook salmon migration ...
- Ecology fears over plan to divert more water from Shoalhaven to Sydney in water sharing agreementon October 4, 2021 at 1:06 pm
The environmental health of the Shoalhaven River and the region's oyster farms could be at risk if a new water-sharing strategy is adopted, an Independent MP warns.
- Could Coralville Lake disappear? Here's what's being done to try and save the man-made reservoir.on October 4, 2021 at 3:45 am
The Friends of Coralville Lake and U.S. Army Corps of Engineers believe sediment buildup will make Coralville Lake disappear before end of the century.
- Dam project criticized for threatening Australia's World Heritage-listed Blue Mountainson September 30, 2021 at 1:11 am
Plans to raise the walls of a dam that blocks off a waterway that borders on the World Heritage-listed Blue Mountains National Park in the Australian state of New South Wales (NSW) have been shrouded ...
via Bing News