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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Stochastic environmental research and risk assessment 11 (1997), S. 483-510 
    ISSN: 1436-3259
    Keywords: Conceptual-stochastic models ; shot noise ; streamflow simulation ; time aggregation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract A conceptual-stochastic approach to short time runoff data modelling is proposed, according to the aim of reproducing the hydrological aspects of the streamflow process and of preserving as much as possible the dynamics of the process itself. This latter task implies preservation of streamflow characteristics at higher scales of aggregation and, within a conceptual framework, involves compatibility with models proposed for the runoff process at those scales. At a daily time scale the watershed response to the effective rainfall is considered as deriving from the response of three linear reservoirs, respectively representing contributions to streamflows of large deep aquifers, with over-year response lag, of aquifers which run dry by the end of the dry season and of subsurface runoff. The surface runoff component is regarded as an uncorrelated point process. Considering the occurrences of effective rainfall events as generated by an independent Poisson process, the output of the linear system represents a conceptually-based multiple shot noise process. Model identification and parameter estimation are supported by information related to the aggregated runoff process, in agreement to the conceptual framework proposed, and this allows parameter parsimony, efficient estimation and effectiveness of the streamflow reproduction. Good performances emerged from the model application and testing made with reference to some daily runoff series from Italian basins.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-9648
    Keywords: Stochastic models ; Total rainfall ; Effective rainfall ; Streamflow ; Inverse estimation ; Hydrometeorology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Sommario Raccordando i risultati di due ricerche sui modelli stocastici di pioggia e dei deflussi, vengono qui studiate le relazioni fra la pioggia totale e la pioggia efficace. I deflussi aggregati a breve scala temporale sono esaminati alla luce delle caratteristiche climatiche e idrogeologiche del bacino idrografico, identificando quanttro distinte componenti che danno origine al deflusso. II bacino idrografico viene così rappresentato da un sistema lineare a quattro componenti, il cui input è la pioggia efficace. Pertanto, il modello dei deflussi viene usato per effettuare la stima inversa delle piogge efficaci, consentendo lo studio delle relazioni fra le piogge totali ed efficaci ipotizzando una semplice legge di trasformazione. La determinazione di questa legge è effettuata applicando un modello stocastico, i cui parametri sono stimati sulle serie corrispondenti di pioggia totale registrata e di pioggia efficace ricostruita. Un'applicazione a un caso reale mostra l'efficacia dell'approccio proposto.
    Notes: Abstract Linking the results of two research topics on rainfall and streamflow stochastic models, the relationship between total and effective rainfall is studied here. The short time streamflow process is examined concerning the climatic and hydrogeological characters of the watershed, identifying four distinct components giving rise to runoff. In this way the watershed can be regarded as a four-component linear system, whose input is the effective rainfall. Finally, the streamflow model is used as an effective rainfall inverse estimator, allowing the analysis of the links between total and effective rainfall assuming a simple transformation law. The determination of this law is performed by applying a stochastic model, whose parameters are estimated on the companion series of recorded total rainfall and reconstructed effective rainfall. An application to a case study shows the effectiveness of the proposed approach.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 1997-12-01
    Print ISSN: 1436-3240
    Electronic ISSN: 1436-3259
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Published by Springer
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