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2. Hydrological impacts of urban expansion in a Brazilian metropolis – Case study of the Vargem das Flores reservoir catchment.

Author

Rosa, Deyvid Wavel Barreto, Das Graças Silva, Talita Fernanda, de Araújo, Rogério Palhares Zschaber, and de Oliveira Nascimento, Nilo

Subjects
*URBAN growth, *METROPOLIS, *GROUNDWATER flow, *WATERSHEDS, *WATER levels, *WATER supply
Abstract

This paper aims to evaluate the hydrologic impacts of urban expansion in a peri-urban catchment that drains into a reservoir of the drinking water supply system of Belo Horizonte Metropolitan Region in Brazil. Despite the metropolitan interest and efforts in protecting the catchment, a recent change in zoning ordinances allowed urban expansion in the area. To evaluate the potential hydrological impacts of this land use regulation change, scenarios of urban expansion were conceived and simulated in the model Dinamica EGO. The Storm Water Management Model (SWMM) was employed to assess potential hydrological impacts of land use change projections. Observed precipitation and water level data of the reservoir were used to calibrate and validate the hydrological model. Results confirm the impacts on several catchment hydrological processes following the progressive urban expansion in the area, particularly on volumes of infiltration, groundwater flow and runoff, increasing peak flows and flooding downstream the reservoir. [ABSTRACT FROM AUTHOR]

Published
2023
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5. Modelling Lake Pampulha: a tool for assessing the catchment area impacts on the phytoplankton dynamics

Author

das Graças Silva, Talita Fernanda, Vinçon-Leite, Brigitte, Giani, Alessandra, Figueredo, Cleber Cunha, Petrucci, Guido, Lemaire, Bruno J., Sperling, Eduardo Von, Tassin, Bruno, Seidl, Martin, Khac, Viet Tran, Viana, Priscila Siqueira, Viana, Valquíria Flávia Lima, Toscano, Rodrigo Argolo, Rodrigues, Brenner Henrique Maia, Nascimento, Nilo de Oliveira, Universidade Federal de Minas Gerais [Belo Horizonte] (UFMG), laboratoire Eau Environnement et Systèmes Urbains (LEESU), and AgroParisTech-École des Ponts ParisTech (ENPC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)

Subjects
urban lakes, [SDV.EE.ECO]Life Sciences [q-bio]/Ecology, environment/Ecosystems, lake modelling, modelagem de lagos, modelagem hidrológica, [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology, hydrological modelling, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, lagos urbano
Abstract

International audience; In urban areas the increasing imperviousness is responsible for rising runoff volume and speed, leading to a greater capacity to load nutrients and pollutants into reservoirs. In order to study the impacts of catchment changes on the phytoplankton dynamics in urban lakes, a modelling approach in which a hydrological model is connected to an ecological lake model is proposed for Lake Pampulha (Brazil). In this paper we present the methodology used to link both models. Lake Pampulha and its catchment area were intensively monitored between October 2011 and June 2013 in order to provide data for the calibration and validation of both models.The results of the hydrologic model showed good agreement with the in situ measurements, and the Nash coefficient ranged from 0.70 to 0.88. The lake ecological model have successfully represented the cyanobacteria dynamics (normalized mean average error: 0.25–0.42, Pearson coefficient: 0.82–0.89, p

Published
2016

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