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Issue 2, 2020
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A gradient-descent adjoint method for the reconstruction of boundary conditions in a river flow nitrification model

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Abstract

One of the reasons for the limited applicability of predictive water quality models is the lack of data from monitoring control stations that are required as input. In this context, the main novelty of the present work is the recovery of information on the state variables present in a water quality model through measured data at a target downstream location. The reconstruction of the upstream boundary condition is the goal of the present work. For this purpose, an adjoint-state method is developed to find the sensitivities of the functional with respect to variations on the upstream boundary conditions of the model. The resolution of both forward and backward problems ensures strong, accurate and reliable solutions in both steady state and unsteady scenarios. The different cases demonstrate that the method is able to reconstruct any observed distribution with little computational effort, including the heat balance with all its external inputs.

Graphical abstract: A gradient-descent adjoint method for the reconstruction of boundary conditions in a river flow nitrification model

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Article information


Submitted
30 Oct 2019
Accepted
03 Jan 2020
First published
08 Jan 2020

Environ. Sci.: Processes Impacts, 2020,22, 381-397
Article type
Paper

A gradient-descent adjoint method for the reconstruction of boundary conditions in a river flow nitrification model

G. Gordillo, M. Morales-Hernández and P. García-Navarro, Environ. Sci.: Processes Impacts, 2020, 22, 381
DOI: 10.1039/C9EM00500E

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