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Creator:: Jackson, Tracie R., Haggerty, Roy, Apte, Sourabh V., and O’Connor, Ben L.
Abstract:: Accurate estimates of mass-exchange parameters in transient storage zones are needed to better understand and quantify solute transport and dispersion in riverine systems. Currently, the predictive mean residence time relies on an empirical entrainment coefficient with a range in variance due to the absence of hydraulic and geomorphic quantities driving...
Resource Type:: Article
Full Text:: ., 2008; Constantinescu et al., 2009]. Developing new or improving previously derived relationships is

Creator:: Jackson, T. R., Haggerty, R., and Apte, Sourabh V.
Abstract:: Surface transient storage (STS) and hyporheic transient storage (HTS) have functional significance in stream ecology and hydrology. Currently, tracer techniques couple STS and HTS effects on stream nutrient cycling; however, STS resides in localized areas of the surface stream and HTS resides in the hyporheic zone. These contrasting environments result...
Resource Type:: Article
Full Text:: typically use 1-D transient storage models (e.g., OTIS; Bencala and Walters, 1983; Runkel, 1998) to quantify

Creator:: Jackson, Tracie R., Haggerty, Roy, Apte, Sourabh V., Coleman, Anthony, and Drost, Kevin J.
Abstract:: Surface transient storage (STS) has functional significance in stream ecosystems because it increases solute interaction with sediments. After volume, mean residence time is the most important metric of STS, but it is unclear how this can be measured accurately or related to other timescales and field-measureable parameters. We studied mean...
Resource Type:: Article
Full Text:: , 2008; Weitbrecht et al., 2008; Constantinescu et al., 2009]. Mathematical definitions of these

Creator:: Jackson, Tracie R., Apte, Sourabh V., and Haggerty, Roy
Abstract:: In field studies of solute transport, transient storage within lateral cavities and other stream features generates breakthrough curves (BTCs) with pronounced and persistent skewness. Current solute transport theory requires that the coefficient of skewness (CSK) decrease over time because the system eventually reaches Fickian conditions. However, published data show that...
Resource Type:: Article
Full Text:: , Roy Haggerty b,d,2 aU.S. Geological Survey, 160 N Stephanie St, Henderson, NV 89074, United States

Creator:: Finn, Justin and Apte, Sourabh V.
Abstract:: The computation of Lagrangian coherent structures typically involves post-processing of experimentally or numerically obtained fluid velocity fields to obtain the largest finite-time Lyapunov exponent (FTLE) field. However, this procedure can be tedious for large-scale complex flows of general interest. In this work, an alternative approach involving computation of the FTLE...
Resource Type:: Article
Full Text:: t1t0(x0, t0) = x0 + ∫ t1 t0 u(x(τ), τ)dτ. (1) The flow map may be computed in forward time (t1 > t0

Creator:: Apte, Sourabh V. and Finn, Justin R.
Abstract:: A numerical scheme for fully resolved simulation of particle–fluid systems with freely moving rigid particles is developed. The approach is based on a fictitious domain method wherein the entire particle–fluid domain is assumed to be an incompressible fluid but with variable density. The flow inside the particle domain is constrained...
Resource Type:: Article
Full Text:: resulting in DΘ Dt = 0, (2) where D/Dt is the material derivative. The fluid velocity field is

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