scholarly journals Fractal measurement of river bed surface and its application on river pattern discrimination

2015 ◽  
Vol 45 (10) ◽  
pp. 1073-1079 ◽  
Author(s):  
JiaHua WEI ◽  
YinJun ZHOU ◽  
WenLei CHEN ◽  
MeiJiao LI
Keyword(s):  
Pattern Discrimination ◽  
River Bed ◽  
River Pattern

Application of Fractal Theory on River Bed Form

2012 ◽  
Vol 212-213 ◽  
pp. 236-240 ◽  
Author(s):  
Yin Jun Zhou ◽  
Fei Li ◽  
Li Chen ◽  
Zhong Wu Jin ◽  
Jun Wang
Keyword(s):  
Fractal Dimension ◽  
Surface Area ◽  
Fractal Theory ◽  
Irregular Boundary ◽  
Surface Fractal Dimension ◽  
Surface Fractal ◽  
River Bed ◽  
Bed Form ◽  
Fractal Characteristics ◽  
River Pattern

Fractal theory is used to describe river bed form. Based on improvements in some aspects of Surface area – Scale Method, such as, estimation of surface area, boundary treatment and so on, the calculation method of surface fractal dimension with irregular boundary is obtained, and the new method has good application on the bed surface fractal dimension calculation. The fractal characteristics of river bed surface morphology are discussed by combination with river-pattern, river regime, river process and changes of BSD. BSD can be used to study some related problems, such as analysis of river regime, distinction of river pattern, calculation of river resistance and so on.

Application of Fractal Theory in the River Regime in the Lower Yellow River

2012 ◽  
Vol 190-191 ◽  
pp. 1238-1243 ◽  
Author(s):  
Shi Min Tian ◽  
Xiao Hui Su ◽  
Wei Hong Wang ◽  
Rui Xun Lai
Keyword(s):  
Fractal Dimension ◽  
Yellow River ◽  
Fractal Theory ◽  
Fractal Dimensions ◽  
Pattern Discrimination ◽  
River System ◽  
Important Variable ◽  
Lower Yellow River ◽  
The Lower Yellow River ◽  
River Pattern

From 1960 to 1999, the river regime in the Lower Yellow River had been the wandering. After the operation of Xiaolangdi Reservoir, the river regime in the Lower Yellow River has experienced some changes because of the reduced discharge and sediment loads. According to the river regime maps, the wandering features of the Lower Yellow River are inhibited and the river channel is becoming stable. In addition, the fractal dimension method is introduced to discriminate the river regime. The river fractal features are able to reflect the features of river system and the fractal dimension is an important variable that can reflect the fractal features. Based on the basic principle of fractal theory, the fractal dimension method is applied to discriminate the river pattern evolution of the Lower Yellow River. The results show that all the fractal dimensions of the three studied reaches decrease from 1-1.35 before 2004 to less 1.05 after 2004, indicating that the river regimes are becoming more regular. It means that the discrimination results fit well with the facts and the fractal dimension method is suitable for the river pattern discrimination.

Spatial Pattern Discrimination in Rats

2003 ◽  
Author(s):  
Kelly A. Digian ◽  
Michael Brown
Keyword(s):  
Spatial Pattern ◽  
Pattern Discrimination

Discharge Pattern Discrimination for Composite Insulation System in Vacuum

2016 ◽  
Vol 136 (9) ◽  
pp. 594-602 ◽  
Author(s):  
Fei Kong ◽  
Hiroki Kojima ◽  
Toshinori Kimura ◽  
Mitsuru Tsukima ◽  
Naoki Hayakawa
Keyword(s):  
Pattern Discrimination ◽  
Discharge Pattern ◽  
Insulation System

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.

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