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  • 11
    Digitale Medien
    Digitale Medien
    On predicting upland erosion losses from rainfall depth (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 135-140 
    Details
    ISSN: 1436-3259
    Schlagwort(e): Upland erosion ; annual soil losses
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Energietechnik , Geographie , Geologie und Paläontologie
    Notizen: Abstract Annual erosion losses from 135 experimental plots under a variety of soil types, vegetation cover densities and conservation practices in Iraq have been measured over a period of four years. The first three years of this data set demonstrate that annual erosion losses can be predicted from annual rainfall depths. The results obtained from regression analysis were then validated with the fourth year of soil erosion data. These results corroborate the theoretical findings of the companion paper in that long term erosion losses can be predicted from the total amount of rainfall.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01543809
    Standort Signatur Erwartet Verfügbarkeit
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  • 12
    Digitale Medien
    Digitale Medien
    Multivariate contemporaneous ARMA model with hydrological applications (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 141-154 
    Details
    ISSN: 1436-3259
    Schlagwort(e): Contemporaneous ARMA models ; maximum likelihood estimation ; multivariate modelling ; stochastic hydrology ; time series analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Energietechnik , Geographie , Geologie und Paläontologie
    Notizen: Abstract In order to allow contemporaneous autoregressive moving average (CARMA) models to be properly applied to hydrological time series, important statistical properties of the CARMA family of models are developed. For calibrating the model parameters, efficient joint estimation procedures are investigated and compared to a set of uivariate estimation procedures. It is shown that joint estimation procedures improve the efficiency of the autoregressive and moving average parameter estimates, but no improvements are expected on the estimation of the mean vector and the variance covariance matrix of the model. The effects of the different estimation procedures on the asymptotic prediction error are also considered. Finally, hydrological applications demonstrate the usefulness of the CARMA models in the field of water resources.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01543810
    Standort Signatur Erwartet Verfügbarkeit
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  • 13
    Digitale Medien
    Digitale Medien
    A linearly regressive Gamma Markov process (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 155-160 
    Details
    ISSN: 1436-3259
    Schlagwort(e): Gamma Markov ; estimation ; maximum likelihood estimates
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Energietechnik , Geographie , Geologie und Paläontologie
    Notizen: Abstract The linearly regressive Gamma Markov sequence is being increasingly used as a model for geophysical phenomena, one of the reasons being that it is possible to determine the distribution of (weighted or otherwise) cumulative sums of such a sequence. In this paper we show briefly how to simulate such a sequence and its seasonal extension; we also show how to estimate its parameters. It is shown that the estimates obtained by the method of moments do not have a high efficiency, whereas those obtained by a modified maximum likelihood method have an efficiency close to unity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01543811
    Standort Signatur Erwartet Verfügbarkeit
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  • 14
    Digitale Medien
    Digitale Medien
    The inverse problem and ground water management (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 161-168 
    Details
    ISSN: 1436-3259
    Schlagwort(e): Inverse problem ; groundwater management ; groundwater response function ; stochastic control ; consistent parameter estimation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Energietechnik , Geographie , Geologie und Paläontologie
    Notizen: Abstract The response of groundwater basins to natural and anthropogenic inputs depends on many interrelated factors such as the values of groundwater flow and mass transport parameters. This work presents a theoretical analysis of the impact of parameter uncertainty on groundwater management decisions. It is shown that under classical, Bayesian, and deterministic assumptions about the parameter structure, the resulting management decisions could be very different. This underscores the importance of adopting the proper parameter structure and the need for using consistent methods to solve the inverse problem.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01543888
    Standort Signatur Erwartet Verfügbarkeit
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  • 15
    Digitale Medien
    Digitale Medien
    A feature based method for tracking mesoscale rainfall areas in radar images (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 185-198 
    Details
    ISSN: 1436-3259
    Schlagwort(e): Pattern matching ; tracking ; rainfall ; mesoscale ; radar
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Energietechnik , Geographie , Geologie und Paläontologie
    Notizen: Abstract This paper presents a new feature-based matching algorithm for tracking mesoscale precipitation phenomena in radar image sequences. Distinct rainfall areas are identified in each image and characterized by a feature vector of shape descriptors, which provide a mathematical representation of the spatial characteristics of each identified area. Rainfall areas observed in consecutive images are matched by comparing the relative values of the features. Two match scoring algorithms are developed to generate the initial estimates of correct matches, which are then updated by likelihood measures based on relative location. The method is applied to mesoscale rainfall areas observed in sequences of radar-derived images of rainfall activity over Southwestern Ontario during the summers of 1980 and 1981.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01543890
    Standort Signatur Erwartet Verfügbarkeit
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  • 16
    Digitale Medien
    Digitale Medien
    The two-component extreme value distribution for flood frequency analysis: Derivation of a new estimation method (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 199-208 
    Details
    ISSN: 1436-3259
    Schlagwort(e): Extreme value distribution ; two-component distribution ; maximum entropy principle ; parameter estimation ; regional estimation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Energietechnik , Geographie , Geologie und Paläontologie
    Notizen: Abstract The two component extreme value (TCEV) distribution has recently been shown to account for most of the characteristics of the real flood experience. A new method of parameter estimation for this distribution is derived using the principle of maximum entropy (POME). This method of parameter estimation is suitable for application in both the site-specific and regional cases and appears simpler than the maximum likelihood estimation method. Statistical properties of the regionalized estimation were evaluated using a Monte Carlo approach and compared with those of the maximum likelihood regional estimators.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01543891
    Standort Signatur Erwartet Verfügbarkeit
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  • 17
    Digitale Medien
    Digitale Medien
    A first-order approximation to stochastic optimal control of reservoirs (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 169-184 
    Details
    ISSN: 1436-3259
    Schlagwort(e): Stochastic control and programming ; real-time hydrologic forecasting ; reservoir theory
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Energietechnik , Geographie , Geologie und Paläontologie
    Notizen: Abstract A new approximate method of solution for stochastic optimal control problems with many state and control variables is introduced. The method is based on the expansion of the optimal control into the deterministic feedback control plus a caution term. The analytic, small-perturbation calculation of the caution term is at the heart of the new method. The developed approximation depends only on the first two statistical moments of the random inputs and up to the third derivatives of the cost functions. Its computational requirements do not exhibit the exponential growth exhibited by discrete stochastic DP and can be used as a suboptimal solution to problems for which application of stochastic DP is not feasible. The method is accurate when the cost-to-go functions are approximately cubic in a neighbourhood around the deterministic trajectory whose size depends on forecasting uncertainty. Furthermore, the method elucidates the stochastic optimization problem yielding insights which cannot be easily obtained from the numerical application of discrete DP.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01543889
    Standort Signatur Erwartet Verfügbarkeit
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  • 18
    Digitale Medien
    Digitale Medien
    Transport and sedimentation of particles in a fluid flow (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 209-216 
    Details
    ISSN: 1436-3259
    Schlagwort(e): Transport ; sedimentation ; random walk ; Markov chain in continuous time ; distribution of maximum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Energietechnik , Geographie , Geologie und Paläontologie
    Notizen: Abstract A simple two-dimensional random walk model is developed for the motion of a particle in a fluid flow. Some earlier results for the persistent injection of particles into the flow are extended, and the distribution of the maximum number of particles in suspension over the period (0,t) is derived.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01543892
    Standort Signatur Erwartet Verfügbarkeit
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  • 19
    Digitale Medien
    Digitale Medien
    Statistical aspects of flow in a random network of channels (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 217-240 
    Details
    ISSN: 1436-3259
    Schlagwort(e): Transport of fluid ; random network ; macro-permeability ; micro-geometry ; statistical mechanics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Energietechnik , Geographie , Geologie und Paläontologie
    Notizen: Abstract This paper presents a detailed statistical analysis of Hagen-Poiseuille flow in plane random isotropic networks of interconnected channels. The emphasis is on statistico-geometrical features of networks that affect macroscopic permeability. It is shown that permeability of a network depends on its average co-ordination number, the first two moments of the channel length distribution and other explicitly identifiable geometrical features. Distributions of flow rates in channels and average flow rates are established by minimization of the rate of energy dissipation. Theoretical developments are interpreted in the context of classical statistical mechanics. Analytical results are illustrated and verified using numerical analysis of flow in a simulated random network.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01543893
    Standort Signatur Erwartet Verfügbarkeit
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  • 20
    Digitale Medien
    Digitale Medien
    Announcements (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 280-280 
    Details
    ISSN: 1436-3259
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Energietechnik , Geographie , Geologie und Paläontologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01543099
    Standort Signatur Erwartet Verfügbarkeit
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