搜索结果: 1-12 共查到“水文学 theory”相关记录12条 . 查询时间(0.14 秒)
Characterizing water fingering phenomena in soils using magnetic resonance imaging and multifractal theory
water fingering phenomena magnetic resonance imaging multifractal theory
2009/10/30
The study of water movement in soils is of fundamental importance in hydrologic science. It is generally accepted that in most soils, water and solutes flow through unsaturated zones via preferential ...
Application of Soil Water Flow Theory in Field Simulation
Application Soil Water Flow Theory Field Simulation
2009/10/28
A numerical model based on a finite difference approximation of the basic
differential equation for soil water flow is described. The equation includes a
sink term representing moisture extraction b...
The Step-Drawdown Test and Non-Darcian Flow:A Critical Review of Theory,Methods and Practice
Step-Drawdown Test Non-Darcian Flow Critical Review
2009/10/28
Step-drawdown tests are usually carried out with succeeding steps of increased
pumping yield, each step of equal duration of 1 hour. The background for this
procedure 1s reviewed, and it is shown, t...
Renewal Theory Criteria of Evaluation of Water-Resource Systems:Reliability and Resilience
Theory Criteria Water-Resource Systems Resilience
2009/10/27
The alternative concepts of reliability and resilience criteria of evaluation of
water-resource systems are reviewed. The potential of the renewal theory is
illustrated that covers many alternative ...
Frost Heave due to Ice Lens Formation in Freezing Soils 1.Theory and Verification
Frost Heave Ice Lens Formation Freezing Soils Theory and Verification
2009/10/26
A frost heave model which simulates formation of ice lenses is developed for
saturated salt-free soils. Quasi-steady state heat and mass flow is considered.
Special attention is paid to the transmit...
RESPONSE THEORY FOR ALLUVIAL RIVER ADJUSTMENTS TO ENVIRONMENTAL AND MAN-MADE CHANGES
alluvial channels friction factor dynamic equilibrium
2009/10/13
A response theory is developed for prediction of the direction and magnitude of alluvial river adjustments from one regime to another due to environmental and man-made changes. The theory makes use of...
Preferential transport of water and 131Iodide in a clay loam assessed with TDR-techniques and boundary-layer flow theory
clay loam soil moisture variations boundary-layer flow
2009/6/8
Rapid soil moisture variations were measured with TDR equipment at five depths ranging from 0.1 to 0.9 m during five consecutive infiltration experiments under ponding. Each time, 27 mm of water were ...
Constructal theory of pattern formation
pattern formation turbulent flow structure natural phenomenon
2009/5/7
This review article shows that the occurrence of macroscopic flow configuration is a universal natural phenomenon that can be explained and predicted on the basis of a principle of physics (the constr...
Thresholds, switches and hysteresis in hydrology from the pedon to the catchment scale：a non-linear systems theory
pedon catchment scale non-linear systems theory
2009/5/6
Hysteresis is a rate-independent non-linearity that is expressed through thresholds, switches, and branches. Exceedance of a threshold, or the occurrence of a turning point in the input, switches the ...
Theory and practice of hydrostatic lysimeters for direct measurement of net seepage in a patterned mire in north Scotland
acrotelm blanket mire ecohydrology
2009/3/24
A novel design of lysimeter for use in mires (peatlands) with shallow water tables is described. It employs an hydraulic mechanism for the automatic equilibration of soil moisture distribution between...
Assessment of spatial structure of groundwater quality variables based on the entropy theory
transinformation correlation spatial structure
2009/3/12
Fundamental to the spatial sampling design of a groundwater quality monitoring network is the spatial structure of groundwater quality variables. The entropy theory presents an alternative approach to...
Balancing the books – a statistical theory of prospective budgets in Earth System science
balance budget sampling hypothesis test closing error
2009/3/12
An honest declaration of the error in a mass, momentum or energy balance, ε, simply raises the question of its acceptability: "At what value of ε is the attempted balance to be rejected?" Answering th...