Ecotoxicity and chemical sediment data classification by the use of self-organising maps

2009 ◽  
Vol 631 (2) ◽  
pp. 142-152 ◽  
Author(s):  
Stefan Tsakovski ◽  
Blazej Kudlak ◽  
Vasil Simeonov ◽  
Lidia Wolska ◽  
Jacek Namiesnik
2017 ◽  
Vol 57 ◽  
pp. 159
Author(s):  
Jan Sørensen ◽  
Jákup K. Bærentsen ◽  
Jógvan F. Hansen ◽  
Ámundur Nolsø ◽  
Birna V. Trygvadóttir

<p><strong>Ú</strong><strong>r</strong><strong>t</strong><strong>ak</strong>: Havlívfrøðiliga royndarstøðin hevur síðan 1998 gjørt regluligar kanningar av botnsigi í føroyskum firðum. Kanningarnar fevndu um fylgjandi evnafrøðiligu brigdlar: nøgd av lívrunnum tilfari (gløðitap), sinki, kopari og heildarnøgd av køvievni og fosfori. Greinin viðger broytni av hesum og fevnir um 229 staksýni.</p><p>Í hesi grein eru eisini savnað úrslit, sum onnur hava almannakunngjørt um somu evnafrøðiligu broytlar.</p><p>Úrslitini eru bólkað eftir dýpi og eftir hvørjum slagi av botnsigi, ið tað snýr seg um. Eisini verður hugt eftir, hvussu virðini eru inni við land og borið verður saman við, hvussu tað er útiá.</p><p>Inni við land var nøgdin av lívrunnum tilfari, nitrogeni, fosfori, sinki og kopari í botnsiginum ávikavist: 0,5-13,0 %, 0,14-4,01 g/kg, 0,43-2,02 g/kg, 12-98 mg/kg og 14-120 mg/kg. Útiá var innihaldið av lívrunnum tilfari millum 1,3 og 5,6 %, meðan innihaldið av sinki og kopari vóru 13-47 mg/kg og 5-38 mg/kg.</p><p><strong>A</strong><strong>bstract</strong>: Since 1998 Kaldbak Marine Biological Laboratory (KMBL) has regularly performed seabed surveys in Faroese fjords. The analyses performed on the sediments included the chemical variables: Organic content (loss on ignition), total nitrogen, total phosphorus, zinc and copper. This paper deals with the variability of the variables in the Faroe area.</p><p>The results of 229 seabed samples are included. Inshore data are compared and related to depth intervals and according to sediment types. Sediment data from inshore waters are compared to sediment data from offshore localities.</p><p>Also included in this paper are eight reports that include data on the above mentioned chemical variables.</p><p>From inshore waters the concentration of organic matter, total nitrogen, total phosphorous, zinc and copper in the sediments was, respectively: 0.5-13.0 %, 0.14-4.01 g/kg, 0.43-2.02 g/kg, 12-98 mg/kg and 14-120 mg/kg. Organic content from offshore localities showed values from 1.3 to 5.6 % while the content of zinc and copper were 13-47 mg/kg and 5-38 mg/kg, respectively.</p>


Author(s):  
Hossein Khaledian ◽  
Homayoun Faghih ◽  
Ata Amini

In this study, data classification method was evaluated to increase accuracy of estimating suspended sediment load. To achieve this objective, suspended sediment in Chehelgazi and Khalifeh-Tarkhan rivers in Kurdistan, Iran, were estimated using Sediment Rating Curve (SRC) method in three different approaches of data classification. At first, measured data were modeled without classification. Then, data based on flow statues were divided into two series as high and low flow. Eventually, based on sediment concentration, the data were divided into low and high sediment concentration. Long-term runoff and sediment data were used to calibrate rating curve model. The estimated values were compared with recorded data and the performances of these models were evaluated using statistical criteria. The results indicated an effective role of data classification to improve estimating sediment transportation by rating curve method. In one of the stations, it was observed that due to classification based on river flow and sediment concentration, model efficiency was increased about 45% and 28%, respectively. Furthermore, in case of improving efficiency of SRC method, classifying data based on flow statues was found to be more effective than sediment concentration. The results of this study can be used to improve the management of the basin by more accurately estimating the amount of suspended sediments transporting in the rivers draining to reservoirs.


1984 ◽  
Vol 29 (6) ◽  
pp. 521-521
Author(s):  
Allen E. Bergin
Keyword(s):  

1993 ◽  
Vol 29 (3) ◽  
pp. 457
Author(s):  
Joon Koo Han ◽  
Byung Ihn Choi ◽  
Jin Wook Chung ◽  
Jae Hyung Park ◽  
Gi Seok Han ◽  
...  

2018 ◽  
Vol 58 (1) ◽  
pp. 53-60
Author(s):  
Bartosz Czarnecki

Abstract The paper discusses the spatial consequences of the widespread use of self-driving cars and the resulting changes in the structure of urban areas. Analysing present knowledge on the technology, functionality and future forms of organisation of mobility with this type of means of transportation, conclusions are presented concerning the expected changes in the organisation of space in urban areas. The main achievement of the investigation is an outline of the fields of future research on the spatial consequences of a transportation system with a large share of self-driving cars.


2010 ◽  
Vol 82 (5) ◽  
Author(s):  
Tomasz Miłek ◽  
Piotr Ciostek ◽  
Witold Woźniak ◽  
Andrzej Lewczuk ◽  
Robert Petryka ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document