Multi-resolution Analysis of Long-Term Pressure Transient Data Using Wavelet Methods

1998 ◽  
Author(s):  
Jitendra Kikani ◽  
Meiqing He
Keyword(s):  
Pressure Transient ◽  
Multi Resolution Analysis ◽  
Resolution Analysis ◽  
Transient Data ◽  
Wavelet Methods

Estimation Of Long Term Gas Condensate Well Productivity Using Pressure Transient Data

2005 ◽  
Author(s):  
Raul Osorio ◽  
George Stewart ◽  
Ali Danesh ◽  
D.H. Tehrani ◽  
Mahmoud Jamiolahmady
Keyword(s):  
Gas Condensate ◽  
Well Productivity ◽  
Pressure Transient ◽  
Transient Data

scholarly journals Seasonal and long-term changes in pH in the Dutch coastal zone

2010 ◽  
Vol 7 (11) ◽  
pp. 3869-3878 ◽  
Author(s):  
P. Provoost ◽  
S. van Heuven ◽  
K. Soetaert ◽  
R. W. P. M. Laane ◽  
J. J. Middelburg
Keyword(s):  
Coastal Zone ◽  
Nutrient Loading ◽  
Dominant Role ◽  
Co2 Uptake ◽  
Ph Change ◽  
Multi Resolution Analysis ◽  
Modelling Studies ◽  
Resolution Analysis ◽  
Annual Time

Abstract. Recent observations and modelling studies suggest that biogeochemical changes can mask atmospheric CO2-induced pH decreases. Data collected by the Dutch monitoring authorities in different coastal systems (North Sea, Wadden Sea, Ems-Dollard, Eastern Scheldt and Scheldt estuary) since 1975 provide an excellent opportunity to test whether this is the case in the Dutch coastal zone. The time-series were analysed using Multi-Resolution Analysis (MRA) which resulted in the identification of system-dependent patterns on both seasonal and intra-annual time scales. The observed rates of pH change greatly exceed those expected from enhanced CO2 uptake, thus suggesting that other biogeochemical processes, possibly related to changes in nutrient loading, can play a dominant role in ocean acidification.

scholarly journals Long-term record of pH in the Dutch coastal zone: a major role for eutrophication-induced changes

2010 ◽  
Vol 7 (3) ◽  
pp. 4127-4152 ◽  
Author(s):  
P. Provoost ◽  
S. van Heuven ◽  
K. Soetaert ◽  
R. Laane ◽  
J. J. Middelburg
Keyword(s):  
Coastal Zone ◽  
Dominant Role ◽  
Co2 Uptake ◽  
Rates Of Change ◽  
Multi Resolution Analysis ◽  
Modelling Studies ◽  
Resolution Analysis ◽  
Induced Changes ◽  
Annual Time

Abstract. Recent observations and modelling studies suggest that eutrophication-related biogeochemical changes can mask atmospheric CO2-induced pH decreases. Data collected by the Dutch monitoring authorities in different coastal systems (North Sea, Wadden Sea, Ems-Dollard, Eastern Scheldt and Scheldt estuary) since 1975 provide an excellent opportunity to test whether this is the case in the Dutch coastal zone. The time-series were analysed using Multi-Resolution Analysis (MRA) which resulted in the identification of system-dependent patterns on both seasonal and intra-annual time scales. The observed rates of change greatly exceed those expected from enhanced CO2 uptake, thus confirming that eutrophication can play a dominant role in ocean acidification.

Estimation of Long Term Gas Condensate Well Productivity Using Pressure Transient Data (SPE94065)

2005 ◽  
Author(s):  
R. Osorio ◽  
G. Stewart ◽  
A. Danesh ◽  
D. Therani ◽  
M. Jamiolahmady
Keyword(s):  
Gas Condensate ◽  
Well Productivity ◽  
Pressure Transient ◽  
Transient Data

scholarly journals Exploring the role of hydrological pathways in modulating North Atlantic Oscillation (NAO) teleconnection periodicities from UK rainfall to streamflow

2020 ◽  
Author(s):  
William Rust ◽  
Mark Cuthbert ◽  
John Bloomfield ◽  
Ron Corstanje ◽  
Nicholas Howden ◽  
...  
Keyword(s):  
North Atlantic ◽  
Response Times ◽  
Influential Factors ◽  
The North ◽  
South Wales ◽  
Process Understanding ◽  
Multi Resolution Analysis ◽  
Resolution Analysis ◽  
The Uk

Abstract. An understanding of multi-annual behaviour in streamflow allows for better estimation of the risks associated with hydrological extremes. This is can enable improved preparedness for streamflow-dependant services such as freshwater ecology, drinking water supply and agriculture. Recently, efforts have focused on detecting relationships between long-term hydrological behaviour and oscillatory climate systems (such as the NAO). For instance, the approximate 7-year periodicity of the NAO has been detected in groundwater level records in the North Atlantic region, providing a degree of forecasting for future water resource extremes due to their repeating, periodic nature. However, the extent to which these 7-year NAO-like signals are propagated to streamflow, and the catchment processes that modulate this propagation, are currently unknown. Here, we show statistically significant evidence that these 7-year periodicities are present in streamflow (and associated catchment rainfall), by applying multi-resolution analysis to a large dataset of streamflow and associated catchment rainfall across the UK. Our results provide new evidence for spatial patterns of NAO periodicities in UK rainfall with areas of greatest NAO signal found in south west England, South Wales, Northern Ireland and central Scotland, and that NAO-like periodicities account for a greater proportion of streamflow variability in these areas. Furthermore, we show that subsurface pathway contribution, as characterised by the Baseflow Index (BFI), and the response times of subsurface pathways, as characterised by Groundwater response Time (GRT), are influential factors for streamflow sensitivity to these NAO-like cycles. Our results provide critical process understanding for the screening and use of streamflow teleconnections for the improving the practice and policy of long-term streamflow resource management.

scholarly journals Wavelet Based Simulation and Analysis of Single and Multiple Power Quality Disturbances

2019 ◽  
Vol 9 (2) ◽  
pp. 3909-3914 ◽  
Author(s):  
F. Jandan ◽  
S. Khokhar ◽  
Z. A. Memon ◽  
S. A. A. Shah
Keyword(s):  
Power Quality ◽  
Distributed Generation ◽  
Extraction Process ◽  
Discrete Wavelet ◽  
Multi Resolution Analysis ◽  
Power Quality Disturbance ◽  
Resolution Analysis ◽  
Multiple Power

Improving power quality disturbance (PQD) detection and automatic classification has been a major concern ever since the emergence of sensitive non-linear devices. The role of distributed generation in a power system is the main source of PQDs. Short-term and long-term duration single and multiple complex PQDs are difficult to monitor and need higher accuracy and time. This paper presents the analysis of different and distinctive combinations of PQDs. Variety of single and multiple PQD samples are generated using Matlab environment conferring to IEEE STD 1159-2009. Such disturbance samples are accurately detected and analyzed from waveform patterns using multi resolution analysis based discrete wavelet transform. The generation of samples and detection lies in fact that it can allow the feature extraction process for the training/testing sample features for machine learning based automatic recognition of disturbance types.

scholarly journals On Recovery Guarantees for One-Bit Compressed Sensing on Manifolds

2021 ◽  
Vol 65 (4) ◽  
pp. 953-998
Author(s):  
Mark A. Iwen ◽  
Felix Krahmer ◽  
Sara Krause-Solberg ◽  
Johannes Maly
Keyword(s):  
Compressed Sensing ◽  
Numerical Experiments ◽  
Optimal Scaling ◽  
Intrinsic Dimension ◽  
Recovery Method ◽  
Multi Resolution Analysis ◽  
Resolution Analysis

AbstractThis paper studies the problem of recovering a signal from one-bit compressed sensing measurements under a manifold model; that is, assuming that the signal lies on or near a manifold of low intrinsic dimension. We provide a convex recovery method based on the Geometric Multi-Resolution Analysis and prove recovery guarantees with a near-optimal scaling in the intrinsic manifold dimension. Our method is the first tractable algorithm with such guarantees for this setting. The results are complemented by numerical experiments confirming the validity of our approach.

scholarly journals Simulation of response spectrum-compatible ground motions using wavelet-based multi-resolution analysis

2021 ◽  
pp. 002029402110130
Author(s):  
Guan Chen ◽  
Zhiren Zhu ◽  
Jun Hu
Keyword(s):  
Ground Motion ◽  
Response Spectrum ◽  
Ground Motions ◽  
Power Spectra ◽  
Simulation Method ◽  
Eurocode 8 ◽  
Effective Response ◽  
Multi Resolution Analysis ◽  
Resolution Analysis ◽  
Simulated Ground Motions

This study proposed a simple and effective response spectrum-compatible ground motions simulation method to mitigate the scarcity of ground motions on seismic hazard analysis base on wavelet-based multi-resolution analysis. The feasibility of the proposed method is illustrated with two recorded ground motions in El Mayor-Cucapah earthquake. The results show that the proposed method enriches the ground motions exponentially. The simulated ground motions agree well with the attenuation characteristics of seismic ground motion without modulating process. Moreover, the pseudo-acceleration response spectrum error between the recorded ground motion and the average of the simulated ground motions is 5.2%, which fulfills the requirement prescribed in Eurocode 8 for artificially simulated ground motions. Besides, the cumulative power spectra between the simulated and recorded ground motions agree well on both high- and low-frequency regions. Therefore, the proposed method offers a feasible alternative in enriching response spectrum-compatible ground motions, especially on the regions with insufficient ground motions.

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