Development of a distributed hydrological software application employing novel velocity-based techniques

Risva, Konstantina; Ρίσβα, Κωνσταντίνα

dc.contributor.author	Risva, Konstantina	en
dc.contributor.author	Ρίσβα, Κωνσταντίνα	el
dc.date.accessioned	2019-05-08T10:10:36Z
dc.date.available	2019-05-08T10:10:36Z
dc.date.issued	2019-05-08
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/48651
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.9117
dc.description	Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Επιστήμη και Τεχνολογία Υδατικών Πόρων”	el
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/gr/	*
dc.subject	Μοντέλα βροχής-απορροής	el
dc.subject	Python & Υδρολογία	el
dc.subject	Βελτιωμένη NRCS-CN μέθοδος	el
dc.subject	Ταχύτητα υδατορεύματος	el
dc.subject	Κατανεμημένα μοντέλα μεμονωμένων επεισοδίων	el
dc.subject	Rainfall-Runoff models	en
dc.subject	Python & Hydrology	en
dc.subject	Improved NRCS-CN method	en
dc.subject	Channel velocities	en
dc.subject	Distributed event-based m	en
dc.title	Development of a distributed hydrological software application employing novel velocity-based techniques	en
dc.title	Ανάπτυξη κατανεμημένου υδρολογικού λογισμικού με εφαρμογή καινοτόμων κινηματικών τεχνικών	el
heal.type	masterThesis
heal.classification	Hydrologic models	en
heal.classification	ΥΔΡΟΛΟΓΙΑ	el
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh85063451
heal.classificationURI	http://data.seab.gr/concepts/32c23962aad57b536013fb3a01eb4c9d90031796
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2018-11-20
heal.abstract	The aim of this study is the development of an event-based distributed hydrological model, incorporating novel methodologies for estimating the effective rainfall and representing the routing processes. First, we distinguish the effective from the gross rainfall, at a cell basis, thus extracting the spatial distribution of surface runoff during the simulation period. The underlying model is based on an improved NRCS-CN scheme, which uses a spatially-varying CN (different for each cell) and two lumped dimensionless parameters, i.e. one for representing the antecedent soil moisture conditions (AMC) of the basin at the beginning of the storm event, and one for estimating the initial rainfall abstraction. Key modelling novelty is the adjustment of the so-called reference CN value (i.e. the value that refers to average soil moisture conditions and 20% abstraction ratio) against the two aforementioned lumped parameters. For the propagation of runoff to the basin outlet two flow types are considered, i.e. an overland flow across the catchment’s terrain, and a channel flow along the river network. These are synthesized by employing a velocity-based approach, to determine the flood hydrograph. This approach implements an original methodology for assigning realistic velocity values along the river network. These use macroscopic hydraulic information as well as the time of concentration of the basin, which is considered function of runoff intensity. The proposed approach takes advantage of regional relationships and literature values for assigning appropriate values to all model attributes, except for the two lumped parameters of the rainfall-runoff transformation, which are either manually assigned or inferred through calibration. In the last case, it is essential to extract the sub-surface flow component (interflow) from the total hydrograph, which may be done through several approaches of varying complexity. Here we propose an empirical method, requiring the fitting of a lumped hydrological model the observed hydrograph, which explicitly accounts for the contribution of interflow to total runoff. An alternative, more integrated approach, aims at running the distributed model with additional functionalities, in order to obtain the full hydrograph at the basin outlet. In this context, we have also developed a more generic version of the modeling framework, in which the NRCS-CN procedure is combined with a continuous soil moisture accounting scheme, thus generating both the surface (overland) runoff as well as the interflow through the unsaturated zone. Apparently, this augmented version requires few additional parameters, since more processes are accounted for within the simulation procedure. For the schematization of the model domain, the user needs to formulate two spatial layers, i.e. a grid-based partition of the basin to equally-dimensioned (squared) cells, and a graph- based configuration of the hydrographic network, comprising junctions and interconnected river segments. In the context of model development, we used the high-level programming language, Python, to build a GUI interface, for data management and visualization, and to run simulations and optimizations. The two modeling versions and the software are successfully tested in the representation of two flood events across Nedontas river basin.	en
heal.abstract	Στην παρούσα εργασία αναπτύσσεται ένα μοντέλο βροχής – απορροής προσομοίωσης ενός μεμονωμένου επεισοδίου (event-based), χρησιμοποιώντας κυρίως μία κατανεμημένη (distributed) προσέγγγιση αξιοποιώντας παράλληλα και αδιαμέριστες παραμέτρους για κάποιες διαδικασίες, καθώς και διάφορες τεχνικές για την αναπαράσταση των διεργασιών, τόσο εννοιολογικές όσο και φυσικής βάσης.	el
heal.advisorName	Ευστρατιάδης, Ανδρέας	el
heal.committeeMemberName	Μαμάσης, Νίκος	el
heal.committeeMemberName	Νάνου, Αικατερίνη	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Πολιτικών Μηχανικών	el
heal.academicPublisherID	ntua
heal.numberOfPages	157 σ.	el
heal.fullTextAvailability	true