Three-dimensional water-quality: Transport model compared with field observations

Markku Virtanen, Jorma Koponen, Kim Dahlbo, Juha Sarkkula

Research output: Contribution to journalArticleScientificpeer-review

29 Citations (Scopus)

Abstract

An ecological model, coupled with a hydrodynamic one, is applied to Lake Näsiselkä, the southernmost sub-basin of Lake Näsijärvi, Central Finland. Its surface area is 93 km2, mean depth 15 m, maximum depth 61 m, and through-flow 64 m3/s. The transport velocities to the ecological model are computed with a three-dimensional hydrodynamic sub-model. Its results are compared with the flow velocities measured in 1981. In the ecological model the transport velocities change according to the weather conditions, through-flow and temperature stratification.

The ecological mdoel computes the dissolved oxygen, total phosphorus, phytoplankton biomass, biological oxygen demand and sodium lignosulphonate taking into account their decay, settling, mutual reactions, loading and transport with water flow. The model validity is tested with extensive field observation data of the year 1982 and more sparse data of the summer 1983. The results show reasonable agreement with the measured values.

The model is used to test the effects of human activities (industrial loading and through-flow regulation) on the water quality. Industrial loading affects the oxygen and algal distributions in the lake whereas the executed regulation has not appreciably changed the natural conditions in the water body.

Original languageEnglish
Pages (from-to)185 - 199
Number of pages15
JournalEcological Modelling
Volume31
Issue number1-4
DOIs
Publication statusPublished - 1986
MoE publication typeNot Eligible

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water quality
lake
hydrodynamics
flow regulation
biochemical oxygen demand
flow velocity
water flow
dissolved oxygen
stratification
human activity
surface area
phytoplankton
sodium
phosphorus
oxygen
biomass
summer
basin
temperature

Cite this

Virtanen, Markku ; Koponen, Jorma ; Dahlbo, Kim ; Sarkkula, Juha. / Three-dimensional water-quality : Transport model compared with field observations. In: Ecological Modelling. 1986 ; Vol. 31, No. 1-4. pp. 185 - 199.
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abstract = "An ecological model, coupled with a hydrodynamic one, is applied to Lake N{\"a}siselk{\"a}, the southernmost sub-basin of Lake N{\"a}sij{\"a}rvi, Central Finland. Its surface area is 93 km2, mean depth 15 m, maximum depth 61 m, and through-flow 64 m3/s. The transport velocities to the ecological model are computed with a three-dimensional hydrodynamic sub-model. Its results are compared with the flow velocities measured in 1981. In the ecological model the transport velocities change according to the weather conditions, through-flow and temperature stratification.The ecological mdoel computes the dissolved oxygen, total phosphorus, phytoplankton biomass, biological oxygen demand and sodium lignosulphonate taking into account their decay, settling, mutual reactions, loading and transport with water flow. The model validity is tested with extensive field observation data of the year 1982 and more sparse data of the summer 1983. The results show reasonable agreement with the measured values.The model is used to test the effects of human activities (industrial loading and through-flow regulation) on the water quality. Industrial loading affects the oxygen and algal distributions in the lake whereas the executed regulation has not appreciably changed the natural conditions in the water body.",
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Three-dimensional water-quality : Transport model compared with field observations. / Virtanen, Markku; Koponen, Jorma; Dahlbo, Kim; Sarkkula, Juha.

In: Ecological Modelling, Vol. 31, No. 1-4, 1986, p. 185 - 199.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Three-dimensional water-quality

T2 - Transport model compared with field observations

AU - Virtanen, Markku

AU - Koponen, Jorma

AU - Dahlbo, Kim

AU - Sarkkula, Juha

PY - 1986

Y1 - 1986

N2 - An ecological model, coupled with a hydrodynamic one, is applied to Lake Näsiselkä, the southernmost sub-basin of Lake Näsijärvi, Central Finland. Its surface area is 93 km2, mean depth 15 m, maximum depth 61 m, and through-flow 64 m3/s. The transport velocities to the ecological model are computed with a three-dimensional hydrodynamic sub-model. Its results are compared with the flow velocities measured in 1981. In the ecological model the transport velocities change according to the weather conditions, through-flow and temperature stratification.The ecological mdoel computes the dissolved oxygen, total phosphorus, phytoplankton biomass, biological oxygen demand and sodium lignosulphonate taking into account their decay, settling, mutual reactions, loading and transport with water flow. The model validity is tested with extensive field observation data of the year 1982 and more sparse data of the summer 1983. The results show reasonable agreement with the measured values.The model is used to test the effects of human activities (industrial loading and through-flow regulation) on the water quality. Industrial loading affects the oxygen and algal distributions in the lake whereas the executed regulation has not appreciably changed the natural conditions in the water body.

AB - An ecological model, coupled with a hydrodynamic one, is applied to Lake Näsiselkä, the southernmost sub-basin of Lake Näsijärvi, Central Finland. Its surface area is 93 km2, mean depth 15 m, maximum depth 61 m, and through-flow 64 m3/s. The transport velocities to the ecological model are computed with a three-dimensional hydrodynamic sub-model. Its results are compared with the flow velocities measured in 1981. In the ecological model the transport velocities change according to the weather conditions, through-flow and temperature stratification.The ecological mdoel computes the dissolved oxygen, total phosphorus, phytoplankton biomass, biological oxygen demand and sodium lignosulphonate taking into account their decay, settling, mutual reactions, loading and transport with water flow. The model validity is tested with extensive field observation data of the year 1982 and more sparse data of the summer 1983. The results show reasonable agreement with the measured values.The model is used to test the effects of human activities (industrial loading and through-flow regulation) on the water quality. Industrial loading affects the oxygen and algal distributions in the lake whereas the executed regulation has not appreciably changed the natural conditions in the water body.

U2 - 10.1016/0304-3800(86)90063-3

DO - 10.1016/0304-3800(86)90063-3

M3 - Article

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JO - Ecological Modelling

JF - Ecological Modelling

SN - 0304-3800

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ER -