搜索结果: 166-180 共查到“知识库 水文物理学”相关记录452条 . 查询时间(1.593 秒)
A Kalman filter application to a spectral wave model
Kalman filter spectral wave model
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2009/11/11
A sequential time dependent data assimilation scheme based on the Kalman filter is applied to a spectral wave model. Usually, the first guess covariance matrices used in optimal interpolation schemes ...
Testing and modelling autoregressive conditional heteroskedasticity of streamflow processes
autoregressive conditional heteroskedasticity streamflow processes
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2009/11/9
Conventional streamflow models operate under the assumption of constant variance or season-dependent variances (e.g. ARMA (AutoRegressive Moving Average) models for deseasonalized streamflow series an...
Detection and predictive modeling of chaos in finite hydrological time series
Detection and predictive modeling chaos finite hydrological time series
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2009/11/9
The ability to detect the chaotic signal from a finite time series observation of hydrologic systems is addressed in this paper. The presence of random and seasonal components in hydrological time ser...
Oscillations in critical shearing,application to fractures in glaciers
critical shearing fractures in glaciers
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2009/11/9
Many evidences of oscillations accompanying the acceleration of critical systems have been reported. These oscillations are usually related to discrete scale invariance properties of the systems and e...
An efficient nonlinear cardinal B-spline model for high tide forecasts at the Venice Lagoon
nonlinear cardinal B-spline model high tide forecasts Venice Lagoon
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2009/11/9
An efficient class of nonlinear models, constructed using cardinal B-spline (CBS) basis functions, are proposed for high tide forecasts at the Venice lagoon. Accurate short term predictions of high ti...
Flash-flood forecasting by means of neural networks and nearest neighbour approach–a comparative study
Flash-flood forecasting neural networks nearest neighbour approach
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2009/11/9
In this paper, Multi-Layer Perceptron and Radial-Basis Function Neural Networks, along with the Nearest Neighbour approach and linear regression are utilized for flash-flood forecasting in the mountai...
Spatial dependences among precipitation maxima over Belgium
Spatial dependences precipitation maxima Belgium
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2009/11/3
For a wide range of applications in hydrology, the probability distribution of precipitation maxima represents a fundamental quantity to build dykes, propose flood planning policies, or more generally...
Comparison of gliding box and box-counting methods in river network analysis
gliding box box-counting methods river network analysis
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2009/11/3
We use multifractal analysis to estimate the Rényi dimensions of river basins by two different partition methods. These methods differ in the way that the Euclidian plane support of the measure is cov...
Strongly nonlinear steepening of long interfacial waves
Strongly nonlinear steepening long interfacial waves
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2009/11/3
The transformation of nonlinear long internal waves in a two-layer fluid is studied in the Boussinesq and rigid-lid approximation. Explicit analytic formulation of the evolution equation in terms of t...
Meteorological uncertainty and rainfall downscaling
Meteorological uncertainty rainfall downscaling
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2009/11/3
We explore the sources of forecast uncertainty in a mixed dynamical-stochastic ensemble prediction chain for small-scale precipitation, suitable for hydrological applications. To this end, we apply th...
Particle dispersion processes in two-dimensional turbulence:a comparison with 2-D kinematic simulation
Particle dispersion processes two-dimensional turbulence 2-D kinematic simulation
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2009/11/2
We study numerically the comparison between Lagrangian experiments on turbulent particle dispersion in 2-D turbulent flows performed, on the one hand, on the basis of direct numerical simulations (DNS...
Lacunarity,predictability and predictive instability of the daily pluviometric regime in the Iberian Peninsula
Lacunarity predictability predictive instability daily pluviometric regime Iberian Peninsula
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2009/11/2
The complexity of the daily pluviometric regime of the Iberian Peninsula is analysed from the point of view of its lacunarity, predictability and predictive instability. The database consists of daily...
Multiscaling analysis of high resolution space-time lidar-rainfall
Multiscaling analysis high resolution space-time lidar-rainfall
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2009/10/30
In this study, we report results from scaling analysis of 2.5 m spatial and 1 s temporal resolution lidar-rainfall data. The high resolution spatial and temporal data from the same observing system al...
Large-scale instability of a generalized turbulent Kolmogorov flow
Large-scale instability generalized turbulent Kolmogorov flow
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2009/10/30
We present an analytical study of the large scale instability of a generalized turbulent Kolmogorov flow, i.e. a periodic shear flow where the molecular viscosity has been substituted by an eddy visco...
Quantitative analysis of randomness exhibited by river channels using chaos game technique:Mississippi,Amazon,Sava and Danube case studies
Quantitative analysis river channels chaos game technique
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2009/10/30
This paper presents a numerical evaluation of the randomness which can be observed in the geometry of major river channels. The method used is based upon that of generating a Sierpinski triangle via t...