نتایج جستجو برای: large river

تعداد نتایج: 1105254  

2005
Ellen Wohl Paul L. Angermeier Brian Bledsoe G. Mathias Kondolf Larry MacDonnell David M. Merritt Margaret A. Palmer N. LeRoy Poff David Tarboton

[1] River restoration is at the forefront of applied hydrologic science. However, many river restoration projects are conducted with minimal scientific context. We propose two themes around which a research agenda to advance the scientific basis for river restoration can be built. First, because natural variability is an inherent feature of all river systems, we hypothesize that restoration of ...

Journal: :The Science of the total environment 2008
P Ryan Jackson Carlos M García Kevin A Oberg Kevin K Johnson Marcelo H García

Bidirectional flows in a river system can occur under stratified flow conditions and in addition to creating significant errors in discharge estimates, the upstream propagating currents are capable of transporting contaminants and affecting water quality. Detailed field observations of bidirectional flows were made in the Chicago River in Chicago, Illinois in the winter of 2005-06. Using multip...

Journal: :جغرافیا و مخاطرات محیطی 0
سیدرضا حسین زاده مهناز جهادی طرقی

introduction extreme floods, hyperconcentrated and debris flows are common natural hazards in the basins which located in the northern slops of alborz mountain range (iranian north system). flood occurrence in golestan national park in 2001, 2002 and 2005( hosseinzadeh and jahadi toroghi 2012), yearly flash floods in masuleh catchment( rezaei, 2009), large flood in neka basin in 1999(poorahmad ...

Journal: :Ecological applications : a publication of the Ecological Society of America 2010
Courtney J Conway Christopher P Nadeau Linden Piest

Large flood events were part of the historical disturbance regime within the lower basin of most large river systems around the world. Large flood events are now rare in the lower basins of most large river systems due to flood control structures. Endemic organisms that are adapted to this historical disturbance regime have become less abundant due to these dramatic changes in the hydrology and...

Journal: :PROCEEDINGS OF HYDRAULIC ENGINEERING 1990

2014
Valérie Laperche Jennifer Hellal Régine Maury-Brachet Bernard Joseph Pierre Laporte Dominique Breeze François Blanchard

Use of mercury (Hg) for gold-mining in French Guiana (up until 2006) as well as the presence of naturally high background levels in soils, has led to locally high concentrations in soils and sediments. The present study maps the levels of Hg concentrations in river sediments from five main rivers of French Guiana (Approuague River, Comté River, Mana River, Maroni River and Oyapock River) and th...

Journal: :Environmental science and pollution research international 2013
M Tripti G P Gurumurthy K Balakrishna M D Chadaga

River Swarna, a small tropical river originating in Western Ghats (at an altitude of 1,160 m above mean sea level) and flowing in the southwest coast of India discharges an average of 54 m(3)s(-1) of water into the Arabian Sea, of which significant part is being discharged during the monsoon. No studies have been made yet on the water chemistry of the Swarna River basin, even as half a million ...

2014
Tim Webster

Bridgewater, Nova Scotia, is located 20 km inland from the mouth of the LaHave River estuary on the Atlantic Coast of Canada. Bridgewater is at risk of flooding due to the combined effects of river runoff and a storm surge on top of high tide. Projected increases in sea-level and possible increased river runoff with climate change increase the risk of future flooding. A set of river and ocean w...

2006
K. - E. Lindenschmidt U. Herrmann I. Pech U. Suhr H. Apel A. Thieken

Assessing and mapping damage risk of floods for large river basins is still in its infancy. Damage risk is understood to be the combination of flood hazard and the vulnerability of communities to a flood of a particular return period. Risk is calculated and mapped for two communities in which dykes are not located for flood protection: Meissen on the Elbe River and Döbeln in the Mulde catchment...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید