搜索结果: 1-12 共查到“理学 Chalk”相关记录12条 . 查询时间(0.093 秒)
Meiofauna versus macrofauna: Secondary production of invertebrates in alowland chalk stream
Meiofauna macrofauna Secondary production invertebrates in alow chalk stream
2014/4/17
The whole metazoan community inhabiting macrophyte stands and gravel beds of the English chalk stream River Lambourn were sampled for 1 yr. Secondary production estimates for specific taxa of macrofau...
Micro-seismic precursory cracks prior to rock-fall on coastal chalk cliffs:a case study at Mesnil-Val,Normandie,NW France
Micro-seismic precursory cracks rock-fall coastal chalk cliffs
2009/12/8
Erosion of rock cliffs has been considered to be relatively unpredictable. This perceived stochastic nature of the erosional processes often occurs through collapses along fractures in the rock-mass. ...
Tracer Test in Fractured Chalk 2.Numerical Analysis
Tracer Test Fractured Chalk Numerical Analysis
2009/10/26
A two-well tracer test carried out in fractured chalk was analyzed using a threedimensional
finite-difference model for flow and transport which, was constructed
on the basis of the geological and h...
Tracer Test in Fractured Chalk 1.Experimental Design and Results
Tracer Test Fractured Chalk Experimental Design
2009/10/26
A two-well tracer test was conducted in eastern Denmark, in which a short
duration pulse of lithium chloride was injected into a recharge well and made to
flow through a fractured chalk aquifer to a...
Low Flow Estimation and Hydrogeology in a Chalk Catchment
Low Flow Estimation Hydrogeology Chalk Catchment
2009/10/26
Procedures to estimate low flow statistics at ungauged sites and their relation to
hydrogeology are presented. The discussion is based on an example of a Danish
chalk catchment of 242 kmz, within wh...
Inferring Stratigraphic Position of Fossil Vertebrates from the Niobrara Chalk of western Kansas
Stratigraphic Position Niobrara Chalk western Kansas
2009/10/20
The stratigraphy of the Smoky Hill Chalk Member of the Niobrara Chalk of western Kansas is well understood as a result of the work of Hattin (1982) and Stewart (1988). Marker units identified by Hatti...
The role of diagenisis in the hydrogeological stratification of carbonate aquifers：an example from the chalk at Fair Cross, Berkshire, UK
hydrogeological stratification carbonate aquifers Fair Cross
2009/6/8
Carbonate rocks form important aquifers in many parts of the world and in north-west Europe the Chalk is a primary source of potable water. When flushed with relatively fresh groundwaters, the Chalk ...
The impact of broadleaved woodland on water resources in lowland UK：II. Evaporation estimates from sensible heat flux measurements over beech woodland and grass on chalk sites in Hampshire
broadleaved woodland heat flux water resources chalk sites
2009/5/18
The impact on recharge to the Chalk aquifer of substitution of broadleaved woodland for pasture is a matter of concern in the UK. Hence, measurements of energy balance components were made above beech...
The impact of broadleaved woodland on water resources in lowland UK：I. Soil water changes below beech woodland and grass on chalk sites in Hampshire
water resources broadleaved woodland grass
2009/5/18
The possible effects of broadleaved woodland on recharge to the UK Chalk aquifer have led to a study of evaporation and transpiration from beech woodland (Black Wood) and pasture (Bridgets Farm), grow...
Variability of dissolved CO2 in the Pang and Lambourn Chalk rivers
carbon dioxide surface waters Lambourn Chalk rivers
2009/5/6
This paper presents the results of a two-year field campaign to determine the spatial and temporal variability of groundwater interaction with surface waters in two Cretaceous Chalk catchments (the Pa...
Simplicity versus complexity in modelling groundwater recharge in Chalk catchments
Chalk modelling groundwater recharge
2009/3/17
Models of varying complexity are available to provide estimates of recharge in headwater Chalk catchments. Some measure of how estimates vary between different models can help guide the choice of mode...
Estimating daily recharge to the Chalk aquifer of southern England – a simple methodology
Chalk aquifer root constant recharge Hydrologically Effective Rainfall model
2009/3/17
A simple, practical model for estimating daily recharge - as hydrologically effective rainfall (HER) - to the Chalk outcrop of southern England is presented. Daily meteorological observations are the ...