An approximate solution to the advection-diffusion equation as applied to an estuary

Wang, S.T.; McMillan, Alan F.; Chen, B.H.

doi:10.1016/0022-1694(80)90118-3

Cited by 1 publication

(1 citation statement)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Oxygen is the central element in the water quality assessment and is fundamental in the viability of an aquatic habitat. In two-or three-dimensional bodies of water such as lakes, bays, estuaries or even large rivers, modern models of deoxygenation and reaeration are based on parabolic boundary value problems where dispersion has been added to the earlier Streeter-Phelps model (see [25]). The Streeter-Phelps model was first introduced in [21,1925] and accounts only for reaction and advection phenomena.…”

Section: Introductionmentioning

confidence: 99%

An ill-posed parabolic evolution system for dispersive deoxygenation–reaeration in water

et al. 2013

View full text Add to dashboard Cite

We consider an inverse problem that arises in the management of water resources and pertains to the analysis of the surface waters pollution by organic matter. Most of physical models used by engineers derive from various additions and corrections to enhance the earlier deoxygenationreaeration model proposed by Streeter and Phelps in 1925, the unknowns being the biochemical oxygen demand (BOD) and the dissolved oxygen (DO) concentrations. The one we deal with includes Taylor's dispersion to account for the heterogeneity of the contamination in all space directions. The system we obtain is then composed of two reaction-dispersion equations. The particularity is that both Neumann and Dirichlet boundary conditions are available on the DO tracer while the BOD density is free of any condition. In fact, for real-life concerns, measurements on the dissolved oxygen are easy to obtain and to save. In the contrary, collecting data on the biochemical oxygen demand is a sensitive task and turns out to be a long-time process. The global model pursues the reconstruction of the BOD density, and especially of its flux along the boundary. Not only this problem is plainly worth studying for its own interest but it can be also a mandatory step in other applications such as the identification of the pollution sources location. The non-standard boundary conditions generate two difficulties in mathematical and computational grounds. They set up a severe coupling between both equations and they are cause of ill-posedness for the data reconstruction problem. Existence and stability fail. Identifiability is therefore the only positive result one can seek after ; it is the central purpose of the paper. We end by some computational experiences to assess the capability of the mixed finite element capability in the missing data recovery (on the biochemical oxygen demand).

show abstract

Section: Introductionmentioning

confidence: 99%