Utilization Analysis for 3D River-Bed Data Observation using Airborne Bathymetry LiDAR

2021 ◽  
Vol 29 (4) ◽  
pp. 139-146
Author(s):  
Jae Hak Kim ◽  
Heo Hyun Su ◽  
Gwang Jae Wei ◽  
Dong Ha Lee
Keyword(s):  
River Bed

Distribution of nitrifying bacteria in a shallow stream

1997 ◽  
Vol 36 (8-9) ◽  
pp. 161-166 ◽  
Author(s):  
Ivana Jancarkova ◽  
Tove A. Larsen ◽  
Willi Gujer
Keyword(s):  
Field Experiments ◽  
Heterotrophic Bacteria ◽  
Pollution Source ◽  
Nitrifying Bacteria ◽  
Channel Water ◽  
River Bed ◽  
Hydraulic Conditions ◽  
Major Floods ◽  
Shallow Stream ◽  
Stream Bed

A project investigating the dynamics of self-purification processes in a shallow stream is carried out. Effects of the concentration gradient due to the distance to the pollution source, of hydraulic conditions in the river bed and of storm floods on the distribution of nitrifying bacteria were studied with the help of laboratory and field experiments. Nitrifiers density on the surface of the stream bed increased rapidly up to a distance of 300 m from the WWTP indicating possible competition of the nitrifiers with the heterotrophic bacteria close to the WWTP. Afterwards a slight decrease in the downstream direction was observed. In vertical profiles, higher bacterial densities were found at sites with rapid infiltration of channel water to the stream bed than at sites with no exchange between channel water and stream bed water or where stream bed water exfiltrated. A major flood event scoured the nitrifiers nearly totally from the surface of the river bed. Major floods belong so to the most dominant processes controlling self-purification in shallow streams. Minor floods, however, don't scour bacteria in the depth of the stream bed that could then be important for the self-purification processes.

Predicting river bed substrate cover proportions across New Zealand

CATENA ◽  
2018 ◽  
Vol 163 ◽  
pp. 130-146 ◽  
Author(s):  
Arman Haddadchi ◽  
Doug J. Booker ◽  
Richard J. Measures
Keyword(s):  
New Zealand ◽  
River Bed

The effect of the reunification of Germany on the water chemistry and ecology of selected rivers

1996 ◽  
Vol 23 (1) ◽  
pp. 35-43 ◽  
Author(s):  
Michael S. Adams ◽  
Hartmut Kausch ◽  
Thomas Gaumert ◽  
Karl-Ernst Krüger
Keyword(s):  
Czech Republic ◽  
Species Diversity ◽  
Water Chemistry ◽  
Total Nitrogen ◽  
Chlorinated Hydrocarbons ◽  
The Czech Republic ◽  
Bed Sediments ◽  
Potash Mining ◽  
River Bed ◽  
Substantial Decline

SummaryWe review several studies and provide new data previously unpublished to show that there has been a substantial decline in pollution of German riverine waters since the beginning of German political reunification in 1989. This reduction is notable in the Elbe, which originates in eastern Germany and the Czech Republic. Pollutants such as many of the chlorinated hydrocarbons have fallen substantially in concentration, while others such as arsenic have declined only slightly. Total nitrogen has declined by only a small amount, but ammonium has fallen substantially, while nitrates have increased. Nitrification is no longer a significant drain on oxygen in the tidal stretch of the Elbe, but decomposition of algae from the middle Elbe is now a greater problem in the lower Elbe. The river-bed sediments of the middle Elbe have a higher species diversity. Fisheries are improving, and concentrations of pollutants in fish such as eel and bream have declined significantly. The river Werra has also improved in quality due to reduction in salt loadings from earlier potash mining.

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