Comparison of 1D and 3D reservoir heat transport models and temperature effects on mass transport

Bruna Arcie Polli,Tobias Bleninger

doi:10.1590/2318-0331.241920190023

Bruna Arcie Polli, Tobias Bleninger

Open Access

https://doi.org/10.1590/2318-0331.241920190023

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Journal: RBRH	Publication Date: Jan 1, 2019
Citations: 5	License type: CC BY 4.0

Affiliation: Federal University of Paraná

Abstract

ABSTRACT One and three-dimensional heat transport models are compared in a dendritic reservoir in Brazil. We estimate the periods of temperature stratification for both models using physical indices and temperature gradients. The three-dimensional model reproduces more accurately the water column temperature profiles, however with focus on the physical indices (Wedderburn Number and Lake Number) similar results were obtained with both models. Secondly, we investigated the effects of temperature stratification on substance mass transport using the three-dimensional model. The advective and dispersive transport for a tracer released in a river and in a side arm of the reservoir were quantified. We identified that considering the effects of temperature stratification increased the horizontal advective transport - up to a maximum of 40% increase for the tracer released in the river, and 9% for the side arm. In relation to dispersive transport there was a decrease in transport due to temperature stratification, and no pattern was discernible for the side arm tracer modeling.

Highlights

Lakes and reservoirs vary widely in their size and number
Reservoirs used for hydropower generation may have multiple purposes, as water supply, irrigation, and recreation (SOARES et al, 2008), both, water quantity and quality are important for their operation
We showed that for heat transport modeling a in each case a one-dimensional model describes the thermal structures well enough

Summary

Introduction

Lakes and reservoirs vary widely in their size and number. They comprise approximately 0.02% of the water in the hydrosphere (MARTIN; MCCUTCHEON, 1999), in contrast of 0.00009% in rivers (WETZEL, 1983). It is distinguished between reservoirs and lakes. Construction of large reservoirs in Brazil began in the early 1900s (SOARES et al, 2008). Reservoirs used for hydropower generation may have multiple purposes, as water supply, irrigation, and recreation (SOARES et al, 2008), both, water quantity and quality are important for their operation

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