Matthijs Gensen

Matthijs Gensen
HKV Consultants | HKV

Doctor of Philosophy

About

25
Publications
2,362
Reads
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33
Citations
Additional affiliations
October 2021 - March 2022
HKV Consultants
Position
  • Advisor Rivers Coasts and Deltas
September 2017 - September 2021
University of Twente
Position
  • PhD Student
Description
  • PhD student
Education
October 2014 - March 2017
Delft University of Technology
Field of study
  • Hydraulic Engineering
September 2011 - August 2014
University of Twente
Field of study
  • Civil Engineering

Publications

Publications (25)
Article
Full-text available
Accurate discharge records are essential for flood frequency analyses, hydraulic model calibration and flood forecasting. Discharge records are often obtained via a transformation of water levels to discharges using a rating curve. For accurate rating curves, a physical basis is important, particularly in the extrapolation domain towards extreme di...
Thesis
Full-text available
Accurate predictions of water levels, discharges and their uncertainties are essential for flood risk management of rivers. In river deltas, the river often splits into multiple branches. The discharge of the upstream river is distributed over the branches at the bifurcations. This discharge distribution is controlled by the conveyance capacity of...
Article
Full-text available
In bifurcating rivers, an intervention aimed at flood risk reduction may trigger a change in discharge distribution and thus influence water levels throughout the entire river system. This article aims at assessing the impact of interventions on system‐wide water levels, explicitly accounting for a range of discharges and model parameter uncertaint...
Poster
Full-text available
Accurate discharge estimates and rating curves are crucial for flood risk management. In a bifurcating river, the distribution of discharge over distributaries dominates the downstream water levels and thus the flood risk. However, single-channel rating curves at two major bifurcations of the Rhine river in the Netherlands shows water balance error...
Conference Paper
Full-text available
The amount of discharge in a river section is a key uncertainty factor in flood risk analyses and is determined by upstream conditions as well as the distribution of discharge over river branches at river bifurcations. This study assesses the impact of river interventions in a bifurcating river system, considering the Dutch river Rhine system with...
Conference Paper
Full-text available
Accurate estimates of discharges in rivers are crucial for flood risk management. Rating curves are often used to obtain discharge estimates from water level measurements. In a bifurcating river, accurate estimates of the discharge distribution over distributaries is particularly important, because the discharge dominates the downstream water level...
Conference Paper
Full-text available
At river bifurcations, discharge is distributed over downstream branches, thereby also distributing flood risk. An accurate estimate of the discharge distribution is essential for flood risk management. In our research, we analyze the water balance and discharge distribution at two major bifurcations of the Rhine river in the Nether-lands. The Dutc...
Article
Full-text available
Hydraulic models were used in practice to predict the effect of human intervention during extreme conditions. However, the accuracy of such predictions remains untested. In this study, we compare a simulated trend in water levels covering a twenty-year period of large-scale human intervention with a thirty-year observational record. The results sho...
Conference Paper
Full-text available
Recorded presentation: https://vimeo.com/514382368
Article
Full-text available
Accurate and reliable estimates of water levels are essential to assess flood risk in river systems. In current practice, uncertainties involved and the sensitivity of water levels to these uncertainties are studied in single-branch rivers, while many rivers in deltas consist of multiple distributaries. In a bifurcating river, a feedback mechanism...
Conference Paper
Full-text available
For flood protection it is essential to have accurate estimates of river water levels. In a bifurcating river system, the uncertainty of the discharge distribution over the downstream branches has a main impact on the river water level uncertainty. Sources of uncertainty within the discharge distribution are manifold: e.g. wind, river geometry, mai...
Poster
Full-text available
Water levels in a river branch largely depend on the amount of discharge flowing into the branch (Gensen et al., 2020). Therefore, the discharge distribution at bifurcations points is a crucial aspect for water level predictions and flood protection. The new flood policy in the Netherlands is based on the risk of flooding instead of assessing the s...
Conference Paper
Full-text available
Accurate rating curves are essential for a wide range of river management purposes, particularly as a basis for flood risk management. In our research, we investigate rating curve uncertainties as related to flow measurement errors. We consider the three largest Dutch river Rhine branches (Bovenrijn, Waal and Pannerdensch Kanaal) and the bifurcatio...
Poster
Full-text available
River intervention impact is generally determined using model simulations.With uncertain (model) parameters, the amount of water level reduction of an intervention is uncertain. Interventions implemented near bifurcation points influence the distribution of discharge. However, this effect can be offset by a compensating intervention in the opposing...
Chapter
Quantitative estimations of water level uncertainties are essential for the design and assessment of flood protection systems. This work aims to quantify the water level uncertainties in the bifurcating Dutch river Rhine system as a result of main channel roughness uncertainty. An one-dimensional hydraulic model of the Rhine branches is used to est...
Conference Paper
Full-text available
This work aims to establish discharge-dependent main channel roughness scenarios due to dune dynamics for the four largest Dutch river Rhine branches. Roughness predictions were made using three roughness predictors with dune measurements as input. Although a large scatter in the roughness predictions was observed, roughness scenarios were establis...
Poster
Full-text available
Bifurcating rivers around the world are complex and dynamically active systems. Local changes in the water level can cause effects throughout the entire system. Under the new Dutch probabilistic flood risk framework it is required to determine hydraulic loads for a range of discharges. Wherever possible, involved uncertainties should be quantified....
Research
Full-text available
This literature report forms the basis of the author’s PhD research project with the title: Large-scale uncertainty in river water levels. The aim of this literature report is to find the state-of-the-art knowledge of river water level uncertainties and give an overview of useful quantification techniques. These steps form the basis for the PhD pro...
Thesis
Full-text available
Wave overtopping in harbour areas is a fairly untreated topic in the context of flood risk analyses. Pragmatic approaches were undertaken to evaluate the possible influence of wave overtopping on the frequency of flooding. However no consensus was reached on how wave overtopping in a harbour area could be quantified. In this thesis a non-numerical...
Article
Full-text available
Hydrological extremes are amongst the most devastating forms of natural disasters both in terms of lives lost and socio-economic impacts. There is consequently an imperative to robustly estimate the frequency and magnitude of hydrological extremes. Traditionally, engineers have employed purely statistical approaches to the estimation of flood risk....

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Projects

Project (1)
Project
Under the new Dutch flood risk framework it is required to estimate probabilities of water levels. Therefore, uncertainties are made explicit. A dominant source of uncertainty in river water levels is the uncertainty in the discharge distribution over major bifurcation points, which is in turn affected by regulation structures, bed roughness due to large-scale bed forms and river engineering works. This project uncertainties in bifurcating river systems are explicitly quantified.