IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Urban stormwater runoff impacts on the ecosystem of a tropical lake
Urban stormwater runoff impacts on the ecosystem of a tropical lake
Author : TALITA SILVA(1), BRIGITTE VINÇON-LEITE(2), BRUNO LEMAIRE(2),KASANDRA POAGUE(1)& NILO NASCIMENTO(1)
ABSTRACT
Rain events cause large changes in physicochemical and biological conditions in lakes. Stormwater may modify water
conductivity, increase pollutant and sediment input and promote flushing effects, turbulence and mixing of the water
column due to water inflow, air temperature decrease and strong winds. In turn, changes on physicochemical conditions
have an effect on the dynamics of primary producers and higher trophic levels. In the urban context, catchment response
to rain takes place in a few tens of minutes and the monitoring of urban runoff impacts on lakes should take advantage of
high frequency monitoring technologies, which provide appropriate time resolution for analysing these phenomena.
Improving our understanding of stormwater runoff impacts on lake ecosystems is critical to define strategies for water
resources and catchment management and to cope with land use changes due to population growth and increasing
urbanization as well as climate change impacts on hydrological processes. Lake Pampulha in Brazil (mean depth: 5.0 m,
197 ha) is an urban water body that has been monthly monitored since September 2011. Water temperature, conductivity
and pH were measured every 0.5 m in a middle site in the lake. Flow of Lake Pampulha main tributaries are monitored
every 10 minutes since October 2011 using automatic sensors. The General Lake Model (GLM) was used to model water
temperature and mixing in the lake. Simulated water temperature showed good agreement with observed water
temperature (rmse = 0.70°C). Model results and moni toring data showed that stormwater runoff are responsible for mixing
the water column and disrupting algal growth during wet summer.
File Size : 217,229 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 17/08/2015
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