Environmental Modelling & Software
2017
Peri-urban catchments Hydrological Response Units Urban Hydrological Elements Drainage extraction Computer-assisted mesh generation
Flowpaths are significantly affected by land use change and engineered elements across urban catchments. Conventional GIS-based tools for extracting drainage networks were not developed for urban terrains. This work presents Geo-PUMMA, a GIS toolbox to generate vectorial meshes for terrain representation in distributed hydrological modeling, and to extract drainage patterns in urban and periurban catchments. Geo-PUMMA generates well-shaped Hydrological Response Units (HRUs) and Urban Hydrological Elements (UHEs). The toolbox was used in peri-urban catchments of Chile and France to generate three model meshes with different levels of treatment, and extract and compare their corresponding drainage networks. A recommended mesh is identified, which replicates the main morphological and hydrological features of the reference drainage network, and is able to preserve features at small to medium spatial scales (~80e150 m). Overall Geo-PUMMA can be used to represent the terrain in distributed hydrological modeling applied to urban and peri-urban scales.
P. Sanzana, a,b,e; J. Gironas, a,b,c,d; I. Braud, e; F. Branger, e; F. Rodriguez, f; X. Vargas, g; N. Hitschfeld, h; J.F. Muñoz, a; S. Vicuña, a,d; A. Mejía, i; S. Jankowfsky, j.
a Departamento de Ingeniería Hidraulica y Ambiental, Pontificia Universidad Catolica de Chile, Avenida Vicu ña Mackenna 4860, Santiago, Chile
b Centro de Desarrollo Urbano Sustentable CONICYT/FONDAP/15110020, Avenida Vicuna Mackenna 4860, Santiago, Chile
c Centro de Investigacion para la Gestión Integrada de Desastres Naturales CONICYT/FONDAP/15110017, Avenida Vicuña Mackenna 4860, Santiago, Chile
d Centro Interdisciplinario de Cambio Global, Pontificia Universidad Catolica de Chile, Avenida Vicuña Mackenna 4860, Santiago, Chile
e IRSTEA, UR HHLY, Hydrology-Hydraulic Department, Centre de Lyon-Villeurbanne, 5 rue de la Doua, BP32108, 69126, Villeurbanne, France
f Institut Français des Sciences et Technologies des Transports de l’Amenagement et des Reseaux (IFSTTAR), Departement Geotechnique Eau, Risques naturels et Sciences de la Terre (GERS), et Institut de Recherche en Sciences et Techniques de la Ville (IRSTV), F-44344, Bouguenais, France
g Departamento de Ingeniería Civil, Facultad de Ciencias Físicas y Matematicas, Universidad de Chile, Beauchef, 851, Santiago, Chile
h Computer Science Department, Facultad de Ciencias Físicas y Matematicas, Universidad de Chile, Av. Blanco Encalada, 2120, Santiago, Chile
i Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, State College, PA 16802, USA
j Risk Management Solutions, Inc., Peninsular House, 30 Monument Street, London, EC3R 8NB, UK
