Decomposition of 2D polygons and its effect in hydrological models
| Autor: | J. Romero, Jorge Gironás, Nancy Hitschfeld, Alfonso Mejia, F. Rodriguez, Flora Branger, Pedro Sanzana, Musandji Fuamba, José F. Muñoz, Sebastián Vicuña, Isabelle Braud, Ximena Vargas |
|---|---|
| Přispěvatelé: | Pontificia Universidad Católica de Chile (UC), CENTRO DE DESARROLLO URBANO SUSTENTABLE CONICYT FONDAP SANTIAGO CHL, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), RiverLy (UR Riverly), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), COMPUTER SCIENCE DEPARTMENT FACULTAD DE CIENCIAS FISICAS Y MATEMATICAS UNIVERSIDAD DE CHILE SANTIAGO CHL, Eau et Environnement (IFSTTAR/GERS/EE), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-PRES Université Nantes Angers Le Mans (UNAM), DEPARTMENT OF CIVIL GEOLOGICAL AND MINING ENGINEERING POLYTECHNIQUE MONTREAL CAN, DEPARTAMENTO DE INGENIERIA CIVIL FACULTAD DE CIENCIAS FISICAS Y MATEMATICAS UNIVERSIDAD DE CHILE SANTIAGO CHL, CENTRO DE INVESTIGACION PARA LA GESTION INTEGRADA DE DESASTRES NATURALES CONICYTFONDAP SANTIAGO CHL, DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING THE PENNSYLVANIA STATE UNIVERSITY USA, PONTIFICA UNIVERSIDAD CATOLICA DE CHILE SANTIAGO DE CHILE CHL |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
POLYGONAL DECOMPOSITION
ZABR-OBSERVATOIRE OTHU Atmospheric Science 010504 meteorology & atmospheric sciences 0207 environmental engineering Geometry 02 engineering and technology 15. Life on land Geotechnical Engineering and Engineering Geology 01 natural sciences SPATIAL UNCERTAINTY IN HYDROLOGICAL MODEL [SDE]Environmental Sciences Decomposition (computer science) Environmental science TERRAIN REPRESENTATION 020701 environmental engineering PERI-URBAN FEATURES 0105 earth and related environmental sciences Civil and Structural Engineering Water Science and Technology |
| Zdroj: | Journal of Hydroinformatics Journal of Hydroinformatics, IWA Publishing, 2019, 1, pp.104-122. ⟨10.2166/hydro.2018.031⟩ |
| ISSN: | 1464-7141 |
| DOI: | 10.2166/hydro.2018.031⟩ |
| Popis: | 2D non-uniform polygonal meshes allow representation of the impact of landscape elements and small infrastructures on water flows. The initial vectorial mesh, derived from the intersection of several geographical information systems' layers, can have highly non-convex or sliver polygons. These bad-shaped elements compromise accurate numerical flow computation. We propose a flexible divide-and-conquer strategy to decompose polygons into physiographical meaningful parts using shape descriptors to better represent the surface terrain and hydrologic connectivity. We use the convexity index (CI) and the form factor (FF) to consider convex and square like optimum shapes. The strategy was applied to two peri-urban areas whose hydrologic response was simulated using distributed modeling. Good-quality meshes were generated with threshold values of CI≈0.8 and FF≈0.2, and CI≈0.95 and FF≈0.4 for undeveloped and highly urbanized zones, respectively. We concluded that the mesh segmentation facilitates the representation of the spatially distributed processes controlling not only the lumped response of the catchment, but also the spatial variability of water quantity and fluxes within it at medium and small scales. |
| Databáze: | OpenAIRE |
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