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Showing 1 to 20 of 72 for “"base flow"”.
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Base Flow Recession Analysis for Streamflow and Spring Flow
<p>Base flow recession curve during a dry period is a distinct hydrologic signature of a watershed. The base flow recession analysis for both streamflow and spring flow has been extensively studied in the literature. Studies have shown that the recession behaviors during the early stage and the …
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Measurements and Visualizations of a Three-Dimensional Compressible Base Flow
Flow visualizations provide evidence of expected mean-flow features, including a shock/expansion discontinuity of circumferentially varying strength at the angular discontinuity, a base-edge expansion fan, a separated shear layer, an asymmetric recirculation region, and a turbulent wake. A strong …
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A Numerical Study of Unsteady Two-Dimensional Subsonic Compressible Base Flow
In subsonic flow, the wake behind a two-dimensional body with a blunt trailing edge is dominated by a regular array of alternately shed vortices. This separated flow produces a low pressure on the base of the body, resulting in a drag component known as the base drag, which can constitute a major …
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Geologic Controls of Base-Flow of Mountain Streams in Northern Nevada
Made available in DSpace on 2014-12-04T19:14:25Z (GMT). No. of bitstreams: 1 6402879.pdf: 3731017 bytes, checksum: 6bb8b8dffcf059659b8ac865a12bc6b2 (MD5) Previous issue date: 1963
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Stereoscopic PIV measurements and proper orthogonal decomposition of a supersonic axisymmetric base flow
The supersonic flow separating past a cylindrical afterbody generates a complex, compressible and highly turbulent flowfield. This flow models several realistic applications, such as the wake region behind projectiles, bullets and unpowered rockets. A blowdown-type supersonic wind tunnel built …
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Land Cover Influences on Stream Nitrogen Dynamics During Storms
… influence on stream nitrogen have focused on base flow conditions or were conducted specifically within urbanized or primarily agricultural watersheds. While these studies have shown relationships between land cover and nitrogen, this relationship and the scale of influence could change during …
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Shape Optimisation for Hydrodynamic Stability and its Application to Cyclone Separators
… applications it is desirable to have a steady flow field that is stable to perturbations. This can be described through a global stability analysis. This is an eigenvalue problem which gives a series of mode shapes (the eigenfunctions) and their growth rates and frequencies (the eigenvalues). …
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Stability of a condensate film flowing down a vertical plane
… stability problem is derived under the parallel flow assumption. A second—order perturbation solution of the stability problem is presented using the Nusselt solution as base flow. The boundary layer equations of laminar film condensation are solved to first-order by using perturbation methods. A …
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Hydrogeology and geomorphology of two structurally dissimilar terranes in Pennsylvania
… and hydrologic characteristics.</p><p>Low streamflow characteristics, defined by base-flow recession curves, and streamflow duration, for 25 summer months, show that streams in the folded and faulted Valley and Ridge province have stronger base-flow regimes than those in the relatively undeformed …
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Mechanisms Controlling Non-Steady Plume-Wall Interactions in Rocket Launch-Tubes (Gas, Fluid Dynamics, Rocket Systems, Base Flows, Supersonic Flows)
… mechanisms controlling the interactions between base flow induced irreversibilities with downstream effective critical flow conditions within rocket launch tubes due to friction and/or cross-sectional obstruction are studied here in detail. The analytical treatment by the flow component approach …
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Ground Water Flow and Water Resources Investigation of the Auburn, Summers and Shakertown Springs Karst Ground Water Basins, Logan and Simpson Counties, Kentucky
… Summers Spring was found to have an estimated base flow discharge of 1 – 2 cubic feet per second (cfs) (0.03 – 0.06 cubic meters per second (cms)) and Shakertown Spring an estimated base flow discharge of 8 – 9 cfs (0.2-0.3 cms). Estimation of base flow discharge at Auburn Spring was not …
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Internal composition, structure, and hydrological significance of rock glaciers in the Eastern Cascades, Washington
Low summer river base flow places a strain on natural and economic resources of the Eastern Cascades. A major contributor to stream flow in this region is snow pack which has declined over the past few decades because of a warming climate. In addition, glacial runoff, which contributes …
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Estimating Tributary Phosphorus Loads Using Flow-Weighted Composite Storm Sampling
… and previous studies is the inclusion of flow-weighted composite storm sampling instead of simple grab sample analyses of storm flow. Three of the methods employed flow stratification, and the impact of the base flow separation point was examined. It was found that the Regression Method …
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Projectile thrust-drag optimization with external burning
External burning increases base pressure. The characteristic and linearized equations with heat addition are discuss ed, and the condition for maintaining irrotationa ity with heat addition is derived. A transition model, which extends the Crocco-Lees base flow model, and a spin model are …
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Hydrochemistry in an Alpine Karst System, Sequoia and Kings Canyon National Parks, California
… a pronounced spring run-off, extended periods of base flow quiescence, storm responses tied to precipitation as rain or as snowfall, and clear diurnal and seasonal patterns of discharge. pH and spC values show an inverse relationship to discharge and temperature, which are generally in phase. …
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An experimental investigation of large-scale structures in supersonic reattaching shear flows
… and in the wake region of a supersonic base flow. Single-pulse side and end views were obtained at several streamwise locations to characterize the evolution and three-dimensionality of the large-scale motions. From statistically significant ensembles, spatial correlation fields were …
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Weathering below Irish blanket bogs and impacts on carbon dynamics
… bog hydrology neglect the influence of substrate flow originating in underlying soil and rock. Stream baseflow from substrate sources is a significant input to catchment streams during periods of limited precipitation. The chemistry of base flow is highly influenced by the composition of the …
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Unsteady incompressible viscous flow past stationary, pitching or oscillating airfoil leading edges
… fundamental mechanisms governing the unsteady flow past airfoil leading edges. The approach taken is to study the leading edge in isolation and to use the semi-infinite parabola as a model for the leading-edges of conventional airfoils. Numerical solution methods were developed and implemented …
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Study of Three-Dimensional Vortex Shedding in the Wake of a Square Cylinder
… which has a shedding frequency twice that of the base flow. This intermediate wavelength mode has not been observed in analysis of the circular cylinder. The presence of this new intermediate wavelength mode may explain the complicated behavior observed in direct numerical simulations of the …
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Assessment Of The Macroinvertebrate Assemblages From The Mesohabitats Of A Headwater Stream-Wetland Hydrologic Restoration In Eastern Kentucky
… at the study sites seasonally between high base flow (winter) and low base flow (summer), 4) explore relationships between the macroinvertebrate assemblages and microhabitat variables at the study sites, and 5) determine how accounting for the availability of mesohabitats at the reach scale …
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