Author
Francois Clemens
Other affiliations: Norwegian University of Science and Technology, City University of New York
Bio: Francois Clemens is an academic researcher from Delft University of Technology. The author has contributed to research in topics: Sanitary sewer & Combined sewer. The author has an hindex of 23, co-authored 170 publications receiving 2032 citations. Previous affiliations of Francois Clemens include Norwegian University of Science and Technology & City University of New York.
Topics: Sanitary sewer, Combined sewer, Asset management, Flood myth, Wastewater
Papers published on a yearly basis
Papers
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21 Nov 2001
TL;DR: In this article, some techniques for residue analysis and their applications are discussed and demonstrated by an example, and some applications of residue analysis can be found in the context of model calibration.
Abstract: Calibration of models is mostly focussed on obtaining an 'optimal set of parameter values'. Analysis of the properties of these parameters and the analysis of the differences between model and reafity after parameter optimization are in most cases neglected. In this paper some techniques for residue analysis and their applications are discussed and demonstrated by an example.
2 citations
TL;DR: In this article, the authors show that polyvinyl chloride (PVC) sewer pipes have operated for decades in a hostile environment, raising concern among sewer managers over the longevity of their drainage systems.
Abstract: Polyvinyl chloride (PVC) sewer pipes have operated for decades in a hostile environment, raising concern among sewer managers over the longevity of their drainage systems. Inspection data (CCTV and...
2 citations
07 Sep 2014
TL;DR: In this article, the authors describe the design of a laboratory set-up for evaluating the strength of deteriorated concrete sewer pipes and the test setup is a representation of field conditions in order to see if it is possible to model the field condition.
Abstract: The principle of structural behaviour of buried concrete pipes is fairly understood, except for how material deterioration affects structural behaviour and performance. Consequently, information on the structural behaviour of deteriorated sewer pipes will contribute to better understanding of the changes in status, which is essential for achieving the desired efficiency gains for urban drainage systems. In literature, some attempts to study the behaviour of the buried pipes under laboratory conditions have been reported. However, no attempt was made to evaluate the structural response of deteriorated concrete sewer pipes. The paper describes the design of a laboratory set-up for evaluating the strength of deteriorated sewer pipes. The test setup is a representation of field conditions in order to see if it is possible to model the field condition. Overall, this research is a first step in determining the probability of collapse of deteriorated sewer pipes that will enhance proper decision making for sewer rehabilitation.
2 citations
23 Sep 2018
TL;DR: In this work the inference of the hydraulic and dissolved oxygen processes is presented for a large scale integrated catchment model and posterior parameter probability distributions were computed using one year of measured data in the river.
Abstract: Environmental models often contain parameters, which are not measurable, yet conceptual descriptions of some physical process. The value of such parameters is often derived by measuring internal state model variables in the system and indirectly tuning/calibrating the value of the parameters so some degree of match is achieved. Bayesian inference is a widely used tool in which the modeller can transfer some prior beliefs about the parameter space, which is updated when additional knowledge on the system is acquired (e.g. more measurements are available). However, the amount of simulations required to perform a formal inference becomes prohibitive when using computationally expensive models. In this work the inference of the hydraulic and dissolved oxygen processes is presented for a large scale integrated catchment model. Two emulator structures were used to accelerate the sampling of the river flow and dissolved oxygen dynamics. Posterior parameter probability distributions were computed using one year of measured data in the river.
2 citations
TL;DR: In this paper , a chemo-mechanical model for the simulation of biogenic sulphide corrosion in concrete sewer pipes is presented, where the chemical problem is two-way coupled with a mechanical model that captures the damage processes caused by mechanical deformations, calcium silicate hydrate dissolution and gypsum formation.
2 citations
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6,278 citations
4,201 citations
Journal Article•
TL;DR: In this article, the authors present a document, redatto, voted and pubblicato by the Ipcc -Comitato intergovernativo sui cambiamenti climatici - illustra la sintesi delle ricerche svolte su questo tema rilevante.
Abstract: Cause, conseguenze e strategie di mitigazione Proponiamo il primo di una serie di articoli in cui affronteremo l’attuale problema dei mutamenti climatici. Presentiamo il documento redatto, votato e pubblicato dall’Ipcc - Comitato intergovernativo sui cambiamenti climatici - che illustra la sintesi delle ricerche svolte su questo tema rilevante.
4,187 citations
01 Jan 1997
TL;DR: The boundary layer equations for plane, incompressible, and steady flow are described in this paper, where the boundary layer equation for plane incompressibility is defined in terms of boundary layers.
Abstract: The boundary layer equations for plane, incompressible, and steady flow are
$$\matrix{ {u{{\partial u} \over {\partial x}} + v{{\partial u} \over {\partial y}} = - {1 \over \varrho }{{\partial p} \over {\partial x}} + v{{{\partial ^2}u} \over {\partial {y^2}}},} \cr {0 = {{\partial p} \over {\partial y}},} \cr {{{\partial u} \over {\partial x}} + {{\partial v} \over {\partial y}} = 0.} \cr }$$
2,598 citations