Statistical distribution of series of 12 monthly concentration samples for environmental classification of rivers
International audience Environmental monitoring and classification of rivers in the northern hemisphere is frequently hampered by lack of infrastructure in the scarcely populated areas of the north. Carefully designed economical methods are important. Analysis of 15 constituents in 14 rivers in Icel...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2007
|
Subjects: | |
Online Access: | https://hal.science/hal-00298869 https://hal.science/hal-00298869/document https://hal.science/hal-00298869/file/hessd-4-2561-2007.pdf |
id |
ftccsdartic:oai:HAL:hal-00298869v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:hal-00298869v1 2023-11-12T04:19:27+01:00 Statistical distribution of series of 12 monthly concentration samples for environmental classification of rivers Eliasson, J. Thordarson, T. University of Iceland Reykjavik 2007-08-07 https://hal.science/hal-00298869 https://hal.science/hal-00298869/document https://hal.science/hal-00298869/file/hessd-4-2561-2007.pdf en eng HAL CCSD European Geosciences Union hal-00298869 https://hal.science/hal-00298869 https://hal.science/hal-00298869/document https://hal.science/hal-00298869/file/hessd-4-2561-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1812-2108 EISSN: 1812-2116 Hydrology and Earth System Sciences Discussions https://hal.science/hal-00298869 Hydrology and Earth System Sciences Discussions, 2007, 4 (4), pp.2561-2585 [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2007 ftccsdartic 2023-10-21T23:14:48Z International audience Environmental monitoring and classification of rivers in the northern hemisphere is frequently hampered by lack of infrastructure in the scarcely populated areas of the north. Carefully designed economical methods are important. Analysis of 15 constituents in 14 rivers in Iceland show that monthly samples for a period of 1 year are sufficient for classification provided that the correct statistical distribution is known. Normalizing and plotting all the constituents in each river by rank shows systematic deviations from both the normal and lognormal distributions. When the constituents are pooled by river the result is one distribution for each river, all very similar. A new cumulative distribution function (DoC) is formed as the average of these. It has a long tail similar to that of the lognormal distribution but below the 60% quantile, the DoC differs a lot from the lognormal so if it is to be used, an unbiased estimate of the scale and location parameters will in most cases be difficult to obtain if more than 30?40% of the highest points is used. The influence of the DoC on the classification result is very strong when the 90% quantile is used for classification, but fades out at the 60% quantile. It is shown that the storage effect in rivers with a lake that holds some weeks flow in storage, can have a great influence on the classification result. Article in Journal/Newspaper Iceland Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Eliasson, J. Thordarson, T. Statistical distribution of series of 12 monthly concentration samples for environmental classification of rivers |
topic_facet |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Environmental monitoring and classification of rivers in the northern hemisphere is frequently hampered by lack of infrastructure in the scarcely populated areas of the north. Carefully designed economical methods are important. Analysis of 15 constituents in 14 rivers in Iceland show that monthly samples for a period of 1 year are sufficient for classification provided that the correct statistical distribution is known. Normalizing and plotting all the constituents in each river by rank shows systematic deviations from both the normal and lognormal distributions. When the constituents are pooled by river the result is one distribution for each river, all very similar. A new cumulative distribution function (DoC) is formed as the average of these. It has a long tail similar to that of the lognormal distribution but below the 60% quantile, the DoC differs a lot from the lognormal so if it is to be used, an unbiased estimate of the scale and location parameters will in most cases be difficult to obtain if more than 30?40% of the highest points is used. The influence of the DoC on the classification result is very strong when the 90% quantile is used for classification, but fades out at the 60% quantile. It is shown that the storage effect in rivers with a lake that holds some weeks flow in storage, can have a great influence on the classification result. |
author2 |
University of Iceland Reykjavik |
format |
Article in Journal/Newspaper |
author |
Eliasson, J. Thordarson, T. |
author_facet |
Eliasson, J. Thordarson, T. |
author_sort |
Eliasson, J. |
title |
Statistical distribution of series of 12 monthly concentration samples for environmental classification of rivers |
title_short |
Statistical distribution of series of 12 monthly concentration samples for environmental classification of rivers |
title_full |
Statistical distribution of series of 12 monthly concentration samples for environmental classification of rivers |
title_fullStr |
Statistical distribution of series of 12 monthly concentration samples for environmental classification of rivers |
title_full_unstemmed |
Statistical distribution of series of 12 monthly concentration samples for environmental classification of rivers |
title_sort |
statistical distribution of series of 12 monthly concentration samples for environmental classification of rivers |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00298869 https://hal.science/hal-00298869/document https://hal.science/hal-00298869/file/hessd-4-2561-2007.pdf |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
ISSN: 1812-2108 EISSN: 1812-2116 Hydrology and Earth System Sciences Discussions https://hal.science/hal-00298869 Hydrology and Earth System Sciences Discussions, 2007, 4 (4), pp.2561-2585 |
op_relation |
hal-00298869 https://hal.science/hal-00298869 https://hal.science/hal-00298869/document https://hal.science/hal-00298869/file/hessd-4-2561-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782335870488018944 |