Active tectonics of the South Caspian Basin   总被引：15，自引：0，他引：15  

James Jackson  Keith Priestley  Mark Allen  Manuel Berberian 《Geophysical Journal International》2002,148(2):214-245

  相似文献   

Bent-ray traveltime tomography and migration without ray tracing     

P. E. Ecoublet  S. C. Singh  C. H. Chapman  G. M. Jackson 《Geophysical Journal International》2002,149(3):633-645

  相似文献   

Frequency-dependent anisotropy due to meso-scale fractures in the presence of equant porosity   总被引：14，自引：2，他引：14  

Mark Chapman 《Geophysical Prospecting》2003,51(5):369-379

Fractured rock is often modelled under the assumption of perfect fluid pressure equalization between the fractures and equant porosity. This is consistent with laboratory estimates of the characteristic squirt-flow frequency. However, these laboratory measurements are carried out on rock samples which do not contain large fractures. We consider coupled fluid motion on two scales: the grain scale which controls behaviour in laboratory experiments and the fracture scale. Our approach reproduces generally accepted results in the low- and high-frequency limits. Even under the assumption of a high squirt-flow frequency, we find that frequency-dependent anisotropy can occur in the seismic frequency band when larger fractures are present. Shear-wave splitting becomes dependent on frequency, with the size of the fractures playing a controlling role in the relationship. Strong anisotropic attenuation can occur in the seismic frequency band. The magnitude of the frequency dependence is influenced strongly by the extent of equant porosity. With these results, it becomes possible in principle to distinguish between fracture- and microcrack-induced anisotropy, or more ambitiously to measure a characteristic fracture length from seismic data.  相似文献   

NUMERICAL STUDY ON DOMINATING FACTOR AND KEY AREA OF EL NINO CYCLE FORMATION_*     

Zhang Qin  Haines Keith 《Acta Meteorologica Sinica》1997,11(2):176-186

A coupled model,which is employed to study the dominating factor and key area of El Nino cycle formation,consists of a dynamical ocean model and a statistical atmospheric model.The coupled model with seasonal forcing successfully reproduces the El Nino event cycle which exhibits quasi-regular oscillations with a preferred period of about 4 years.The results show that the heat content(HC) is transported between the eastern and the western tropical Pacific areas.The spatial distribution of HC anomalies for four phases of the whole cycle clearly shows a possible formation mechanism of El Nino.Experiments further suggest that sea surface temperature in the tropical Pacific and HC in the central tropical Pacific are the most important factors and the central tropical Pacific is the most important area for determining formation of El Nino cycle.  相似文献   

Erratum to “Infiltration excess at the Horton Hydrology Laboratory (or not?)” [Journal of Hydrology 293 (2004) 219-234]     

Keith Beven 《Journal of Hydrology》2004,294(4):294-295

  相似文献   

The geoid EDIN2000 and mean sea surface topography around the British Isles   总被引：2，自引：0，他引：2  

Roger Hipkin  Keith Haines  Ciaran Beggan  Richard Bingley  Fabrice Hernandez  Jason Holt  Trevor Baker 《Geophysical Journal International》2004,157(2):565-577

  相似文献   

Crustal structure and earthquake focal depths beneath northeastern India and southern Tibet   总被引：3，自引：0，他引：3  

Supriyo Mitra  Keith Priestley  Anjan Kr Bhattacharyya  V. K. Gaur 《Geophysical Journal International》2005,160(1):227-248

  相似文献   

Deleuze and geophilosophy: a guide and glossary     

Keith Woodward 《Area》2005,37(4):460-461

  相似文献   

Finite‐element modelling of physics‐based hillslope hydrology,Keith Beven,and beyond          下载免费PDF全文

Keith Loague  Brian A. Ebel 《水文研究》2016,30(14):2432-2437

  相似文献   

A modelling framework for evaluation of the hydrological impacts of nature‐based approaches to flood risk management,with application to in‐channel interventions across a 29‐km2 scale catchment in the United Kingdom          下载免费PDF全文

Peter Metcalfe  Keith Beven  Barry Hankin  Rob Lamb 《水文研究》2017,31(9):1734-1748

Nature‐based approaches to flood risk management are increasing in popularity. Evidence for the effectiveness at the catchment scale of such spatially distributed upstream measures is inconclusive. However, it also remains an open question whether, under certain conditions, the individual impacts of a collection of flood mitigation interventions could combine to produce a detrimental effect on runoff response. A modelling framework is presented for evaluation of the impacts of hillslope and in‐channel natural flood management interventions. It couples an existing semidistributed hydrological model with a new, spatially explicit, hydraulic channel network routing model. The model is applied to assess a potential flood mitigation scheme in an agricultural catchment in North Yorkshire, United Kingdom, comprising various configurations of a single variety of in‐channel feature. The hydrological model is used to generate subsurface and surface fluxes for a flood event in 2012. The network routing model is then applied to evaluate the response to the addition of up to 59 features. Additional channel and floodplain storage of approximately 70,000 m³ is seen with a reduction of around 11% in peak discharge. Although this might be sufficient to reduce flooding in moderate events, it is inadequate to prevent flooding in the double‐peaked storm of the magnitude that caused damage within the catchment in 2012. Some strategies using features specific to this catchment are suggested in order to improve the attenuation that could be achieved by applying a nature‐based approach.  相似文献