Importance of desorption process from Abukuma River’s suspended particles in increasing dissolved 137Cs in coastal water during river-flood caused by typhoons

Desorption Characteristics of Crude Oil in Oil-Contaminated Chernozem

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.610-613.3837 ◽

2012 ◽

Vol 610-613 ◽

pp. 3837-3840

Author(s):

Xiao Yan Liu ◽

Ying Li Li ◽

Chun Lei Dai ◽

Xue Ping Chen ◽

Li Sha Chen

Keyword(s):

Crude Oil ◽

Suspended Particles ◽

Experimental Simulation ◽

Desorption Kinetics ◽

Chernozem Soil ◽

Desorption Process ◽

Kinetics Of ◽

Petroleum Pollutants ◽

Desorption Capacity ◽

Typical Soil

The desorption characteristics of the petroleum pollutants in oil-contaminated chernozem was researched in the process of exploring the interaction between crude oil pollutants and the typical soil in Daqing oilfield. The oscillation-equilibrium method was used in desorption experimental simulation. Desorption kinetics of petroleum pollutants, desorption effect of suspended particles concentration, and the influences of pH, temperature on adsorption action were investigated by the experiments. Results showed that the release velocity of petroleum pollutants was rapidly in the first few minutes, however the desorption process approached to balance gradually in 1-2 hours and attained balance completely after 3 hours. In addition, the balanced desorption capacity of the chernozem ascended gradually when desorption process achieved balance, with the increase of pH, concentration of suspended particles and temperature. The chernozem soil had weak desorptive ability to the crude oil pollutants in the Daqing oilfield.

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Extreme Coastal Water Levels Exacerbate Fluvial Flood Hazards in Northwestern Europe

Scientific Reports ◽

10.1038/s41598-019-49822-6 ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 11

Author(s):

Poulomi Ganguli ◽

Bruno Merz

Keyword(s):

Coastal Water ◽

River Discharge ◽

Storm Surges ◽

Water Levels ◽

Peak Discharge ◽

Flood Hazards ◽

Coastal Zones ◽

Winter Storm ◽

Return Levels ◽

River Flood

Abstract Compound flooding, such as the co-occurrence of fluvial floods and extreme coastal water levels (CWL), may lead to significant impacts in densely-populated Low Elevation Coastal Zones. They may overstrain disaster management owing to the co-occurrence of inundation from rivers and the sea. Recent studies are limited by analyzing joint dependence between river discharge and either CWL or storm surges, and little is known about return levels of compound flooding, accounting for the covariance between drivers. Here, we assess the compound flood severity and identify hotspots for northwestern Europe during 1970–2014, using a newly developed Compound Hazard Ratio (CHR) that compares the severity of compound flooding associated with extreme CWL with the unconditional T-year fluvial peak discharge. We show that extreme CWL and stronger storms greatly amplify fluvial flood hazards. Our results, based on frequency analyses of observational records during 2013/2014’s winter storm Xaver, reveal that the river discharge of the 50-year compound flood is up to 70% larger, conditioned on the occurrence of extreme CWL, than that of the at-site peak discharge. For this event, nearly half of the stream gauges show increased flood hazards, demonstrating the importance of including the compounding effect of extreme CWL in river flood risk management.

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