The delineation of the hydrographic network of a basin through geospatial extractions is of extreme importance because it allows us to obtain useful information on the efficient management of water resources and the mitigation of environmental risks. This study focuses on the use of advanced geospatial extraction and analysis techniques to obtain an accurate representation of a hydrographic network, essential for hydrological modeling, flood prevention and land use planning. In this thesis, analyses were conducted on the hydrography of the Biois (BL) basin starting from the use of high-resolution digital maps Terrain Digital Map (DTM), through software such as Arcgis and Matlab. For this thesis the D8 extraction method was used, followed by the imposition of a threshold on the cumulated area, which allowed us to obtain the network extracted from the DTM for the Biois basin. To this result were added the extractions of three tributaries of the Biois stream: Valfredda, Fuciade and Focobon. In order to ascertain the robustness of the implemented tools, the extracted networks were compared with those observed during the in situ surveys and with the official network of the Veneto Region, through a visual analysis. From these analyses, some inconsistencies were identified, including the presence in the networks extracted from the DTM of non-existent channels or the representation of real channels but displaced with respect to those represented by the reference hydrography. These discrepancies were attributed to errors in the flow directions calculated from the starting DTM. This study offers a starting point for the development of more precise models, suitable for the study of the hydrological and chemical response of the basin.
La delineazione del reticolo idrografico di un bacino mediante estrazioni geospaziali è di estrema importanza perché ci permette di ricavare informazioni utili sulla gestione efficiente delle risorse idriche e la mitigazione dei rischi ambientali. Questo studio si concentra sull’uso di tecniche avanzate di estrazione e analisi geospaziale per ottenere una rappresentazione accurata di una rete idrografica, essenziale per la modellazione idrologica, la prevenzione delle inondazioni e la pianificazione del territorio. In questa tesi, sono state condotte analisi sulla idrografia del bacino del Biois (BL) a partire dall’utilizzo di mappe digitali ad alta risoluzione Terrain Digital Map (DTM), attraverso software quali Arcgis e Matlab. Per questa tesi è stato utilizzato il metodo di estrazione D8, seguito dall’imposizione di una soglia sull’area cumulata, che ha permesso di ottenere il reticolo estratto dal DTM per il bacino del Biois. A questo risultato si sono aggiunte le estrazioni di tre affluenti del torrente Biois: Valfredda, Fuciade e Focobon. Al fine di accertare la robustezza degli strumenti implementati, le reti estratte sono state confrontate con quelle osservate durante i rilievi in situ e con il reticolo ufficiale della Regione Veneto, attraverso un’analisi visiva. Da queste analisi sono state individuate alcune incongruenze, tra cui la presenza nelle reti estratte dal DTM di canali inesistenti oppure la rappresentazione di canali reali ma spostati rispetto a quelli rappresentati dall’idrografia di riferimento. Queste discrepanze sono sono state attribuite a errori nelle direzioni dei flussi calcolate dal DTM di partenza. Questo studio offre una base di partenza per lo sviluppo di modelli più precisi, adatti allo studio della risposta idrologica e chimica del bacino.
Rappresentazioni vettoriali del reticolo idrografico del torrente Biois (BL)
BABATO, MARCO
2023/2024
Abstract
The delineation of the hydrographic network of a basin through geospatial extractions is of extreme importance because it allows us to obtain useful information on the efficient management of water resources and the mitigation of environmental risks. This study focuses on the use of advanced geospatial extraction and analysis techniques to obtain an accurate representation of a hydrographic network, essential for hydrological modeling, flood prevention and land use planning. In this thesis, analyses were conducted on the hydrography of the Biois (BL) basin starting from the use of high-resolution digital maps Terrain Digital Map (DTM), through software such as Arcgis and Matlab. For this thesis the D8 extraction method was used, followed by the imposition of a threshold on the cumulated area, which allowed us to obtain the network extracted from the DTM for the Biois basin. To this result were added the extractions of three tributaries of the Biois stream: Valfredda, Fuciade and Focobon. In order to ascertain the robustness of the implemented tools, the extracted networks were compared with those observed during the in situ surveys and with the official network of the Veneto Region, through a visual analysis. From these analyses, some inconsistencies were identified, including the presence in the networks extracted from the DTM of non-existent channels or the representation of real channels but displaced with respect to those represented by the reference hydrography. These discrepancies were attributed to errors in the flow directions calculated from the starting DTM. This study offers a starting point for the development of more precise models, suitable for the study of the hydrological and chemical response of the basin.File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.12608/68514