Ole Mark

Ole Mark
Krüger A/S · Urban Drainage

PhD

About

97
Publications
88,969
Reads
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2,719
Citations
Citations since 2016
20 Research Items
1846 Citations
20162017201820192020202120220100200300
20162017201820192020202120220100200300
20162017201820192020202120220100200300
20162017201820192020202120220100200300
Additional affiliations
January 2000 - April 2003
Asian Institute of Technology
Position
  • Associate Proff. & Program Manger
February 1989 - January 2000
DHI Group
Position
  • Various

Publications

Publications (97)
Article
Full-text available
Sinks configure the surface networks for overland flow processes representations during 1D hydrodynamic modelling. The excessive number of sinks detected from high-resolution DEMs can boost 1D computational costs significantly. To pursue optimal sink numbers and their optimal spatial distribution, a Volume Ratio Sink Screening (VRSS) method was dev...
Article
Full-text available
Recent studies have demonstrated the effectiveness of low impact development (LID) in preventing urban flooding in urban catchments. Majority of the past research focuses on the overall effects of LID on urban flood reduction in various configurations. However, how urban drainage system (UDS) performance changes at spatial scale under LID effective...
Article
Manholes in combined sewers may become surcharged during storm events, resulting in complex mixing conditions. Although manhole hydrodynamics are reasonably well understood, predicting mixing across a surcharged manhole remains a challenge. An analytical compartmental mixing model for manholes, based on jet theory, has been further developed and ap...
Article
Full-text available
Globally, smart meters measuring the water consumption with a high temporal resolution at consumers' households are deployed at an increasing rate. In addition to their use for billing or leak detection purposes, smart meters may provide detailed knowledge of the wastewater inflow to the sewer systems in space and time and open up new types of syst...
Article
Full-text available
The accuracy of two-dimensional hydrodynamic models (2D models) is improved when high-resolution Digital Elevation Models (DEMs) are used. However, the entailed high spatial discretisation results in excessive computational expenses, thus prohibiting their implementation in real-time forecasting especially at a large scale. This paper presents a su...
Article
Accurate model-based forecasts (discharge and water level) are considered significant for efficient planning and management of urban drainage systems. These model-based predictions can be improved by assimilating system measurements in physically based, distributed, 1D hydrodynamic urban drainage models. In the present research, a combined filterin...
Article
Full-text available
Combined sewer overflows (CSO) of mixed stormwater and wastewater pollute nearby receiving surface waters and pose a risk to the environment and human health. We use “integrated stormwater inflow control” to mitigate CSO by dynamically controlling the inflow of stormwater to the combined sewer system in real time, expanding the physical space of tr...
Preprint
Full-text available
The accuracy of two-dimensional urban flood models (2D models) is improved when high-resolution Digital Elevation Models (DEMs) is used, but the entailed high spatial discretisation results in excessive computational expenses, thus prohibiting the use of 2D models in real-time forecasting at a large scale. This paper presents a sub-model approach t...
Article
The ecosystem services (ESS) approach seeks to identify and characterize links between ecosystems and human welfare. The DESSIN ESS evaluation framework is a novel methodology that has been developed to operationalize ecosystem service assessment, with a focus on urban freshwater settings. This paper describes an application of the framework to a r...
Article
Cities increasingly use real-time control of combined sewer systems and green infrastructure to decrease emissions to surface waters, and incorporate infrastructure into the urban landscape to reduce flooding from short, intense rainfall events called cloudbursts, which can cause flash flooding. Inspired by the ‘smart cities’ agenda, we propose the...
Article
Full-text available
The coincidence of two or more extreme events (precipitation and storm surge, for example) may lead to severe floods in coastal cities. It is important to develop powerful numerical tools for improved flooding predictions (especially over a wide range of spatial scales - metres to many kilometres) and assessment of joint influence of extreme events...
Conference Paper
Full-text available
Many cities face issues with rain induced flooding and combined sewer overflows, which can be addressed by using hydrodynamic models. These models are often simplified in a real-time setting to make them faster, and their performance can be improved by using data assimilation. In this study we use the Ensemble Kalman Filter to update a simplified m...
Article
Accurate monthly rainfall forecasting is essential for efficient watershed management, particularly for the current situation with high variation of rainfall due to global climate change. A variety of researchers attempted to develop more sophisticated models to enhance model capability to capture uncertainty due to high variation in rainfall both...
Article
To better understand the impacts of flooding such that authorities can plan for adapting measures to cope with future scenarios, we have developed a modified Drivers-Pressures-State-Impact-Response (DPSIR) framework to allow policy makers to evaluate strategies for improving flood resilience in cities. We showed that this framework proved an effect...
Conference Paper
Copenhagen has planned 300 cloudburst projects to make the city more resilient to extreme rain events. We investigate the potential of using cloudburst roads and retention spaces to convey and store stormwater during moderate sized rain events when downstream overflow from the sewer system is inevitable. This is done by installing devices to contro...
Article
We present a new framework for flexible testing of flood risk adaptation strategies in a variety of urban development and climate scenarios. This framework couples the 1D-2D hydrodynamic simulation package MIKE Flood with the agent-based urban development model DAnCE4Water and provides the possibility to systematically test various flood risk adapt...
Article
This paper presents a novel modeling analysis of a 40-year-long dataset to examine the impact of urbanization, with widespread stormwater infiltration, on groundwater levels and the water balance of a watershed. A dataset on the hydrologic impact of urbanization with extensive stormwater infiltration is not widely available, and is important becaus...
Article
Full-text available
A mathematical model has been developed to describe solute mixing in surcharged manholes using the submerged jet theory. The model has been applied for straight-through flow manholes and for manholes with a difference in the level of the inlet and outlet pipes. The model is applicable to dissolved substances, i.e. the model has not been validated f...
Chapter
Today, more than half of the world’s population is living in cities that are often centres of production, prosperity and development, but when it comes to handling water in urban areas, a number of challenges exist related to providing safe and efficient solutions to urban water issues. Challenges urban water managers face include flooding and extr...
Article
Full-text available
In the last decade, real-time flood forecasting has become a more feasible approach to reducing the impacts of flooding in urban areas. Two key tools in this context are high resolution hydrodynamic modelling in combination with accurate hydrological forcing. In some cases, when it is not possible to produce such accurate flood forecasts based on h...
Article
The phenomenon of urban flooding due to rainfall exceeding the design capacity of drainage systems is a global problem and can have significant economic and social consequences. This is even more extreme in developing countries, where poor sanitation still causes a high infectious disease burden and mortality, especially during floods. At present,...
Article
Full-text available
Stormwater management using water sensitive urban design is expected to be part of future drainage systems. This paper aims to model the combination of local retention units, such as soakaways, with subsurface detention units. Soakaways are employed to reduce (by storage and infiltration) peak and volume stormwater runoff; however, large retention...
Article
Full-text available
Flooding can cause major disruptions in cities, and lead to significant impacts on people, the economy and on the environment. These impacts may be exacerbated by climate and socio-economic changes. Resilience thinking has become an important way for city planners and decision makers to manage flood risks. Despite different definitions of resilienc...
Article
Full-text available
Global flood management is a major issue for most cities which have to deal with worsening factors such as climate change and fast urban growth. Computer models have been used to model and understand urban flooding on a local scale in cities (25–50 km2). It has been practically impossible to model bigger cities in one go in sufficiently high resolu...
Article
Green roofs are being widely implemented for stormwater management and their impact on the urban hydrological cycle can be evaluated by incorporating them into urban drainage models. This paper presents a model of green roof long term and single event hydrological performance. The model includes surface and subsurface storage components representin...
Conference Paper
Full-text available
In many countries, poor sanitation still causes a high infectious disease burden and mortality, especially during floods [2]. The severe impact of flood water was, for instance, illustrated by the 6,921 cases of leptospirosis which were reported during and after the 2000 flood in Thailand, with a resulting 244 deaths. WHO is focusing on the problem...
Article
Full-text available
Quantitative microbial risk assessments (QMRAs) often lack data on water quality leading to great uncertainty in the QMRA because of the many assumptions. The quantity of waste water contamination was estimated and included in a QMRA on an extreme rain event leading to combined sewer overflow (CSO) to bathing water where an ironman competition late...
Article
Full-text available
This paper explores the potential for real-time urban flood forecasting based on literature and the results from an online worldwide survey with 176 participants. The survey investigated the use of data in urban flood management as well as the perceived challenges in data acquisition and its principal constraints in urban flood modelling. It was or...
Article
Full-text available
Global flood management is a major issue for most cities which have to deal with worsening factors such as climate change and fast urban growth. Computer models have been used to model and understand urban flooding on a local scale in cities (25–50 km2). It has been practically impossible to model bigger cities in one go in sufficiently high resolu...
Article
This paper presents a new and simplified modeling concept for soakaway infiltration in the presence of a shallow groundwater table, including representation of the local groundwater mound and its effects on the infiltration rate. The soil moisture retention curve is used to represent the influence of the mound on infiltration rates. The model is in...
Article
Full-text available
All urban drainage networks are designed to manage a maximum rainfall. This situation implies an accepted flood risk for any greater rainfall event. This risk is often underestimated as factors such as city growth and climate change are ignored. But even major structural changes cannot guarantee that urban drainage networks would cope with all futu...
Article
Full-text available
The phenomenon of urban flooding due to rainfall exceeding the design capacity of drainage systems is a global problem and can have significant economic and social consequences. The complex nature of quantitative precipitation forecasts (QPFs) from numerical weather prediction (NWP) models has facilitated a need to model and manage uncertainty. Thi...
Article
Full-text available
Les responsables et les professionnels des réseaux de drainage urbains sont confrontés aux incertitudes socio-économiques et climatiques alors que les réseaux de drainage doivent s'adapter à la pression de l'urbanisation croissante, à l'essor démographique et à la croissance économique. Une manière de gérer l'incertitude liée à cette dynamique est...
Article
The integration of scientific knowledge about possible climate change impacts on water resources has a direct implication on the way water policies are being implemented and evolving. This is particularly true regarding various technical steps embedded into the EU Water Framework Directive river basin management planning, such as risk characterisat...
Article
Full-text available
Highlights ► Soakaway impact on combined sewer overflows (CSOs) are evaluated with a new method. ► The method combines a coupled soakaway-sewer model with detailed spatial analysis. ► CSOs are reduced by 24% if groundwater constraints are included, otherwise 68%. ► The hydraulic coupling between soakaway and sewer contributes to CSO results. ► Grou...
Article
The increased load on urban stormwater systems due to climate change and growing urbanization can be partly alleviated by using soakaways and similar infiltration techniques. However, while soakaways are usually small-scale structures, most urban drainage network models operate on a larger spatial scale and the simulation of individual soakaways in...
Article
In the context of urban flood management, resilience is equal to resisting, recovering, reflecting and responding. The variety of causes of flooding and their consequences underpin the need for increased and internationally coordinated efforts to enhance technologies and policies for dealing with floods. This paper addresses this issue and presents...
Article
Full-text available
Two stormwater infiltration trenches were installed in 1993 in an area in central Copenhagen. The system was monitored continuously for almost three years after establishment, and a small reduction in performance over that time, possibly due to clogging, was noted. A new study was conducted in 2009 to see whether the reduction in performance has co...
Article
Full-text available
The potential devastating effects of urban flooding have given high importance to thorough understanding and management of water movement within catchments, and computer modelling tools have found widespread use for this purpose. The state-of-the-art in urban flood modelling is the use of a coupled 1D pipe and 2D overland flow model to simultaneous...
Article
Full-text available
Automatic methods for model calibration take advantage of the speed and power of computers, while being objective and relatively easy to implement. This paper presents the principles of automatic calibration applicable for urban rainfall-runoff modelling. The automatic scheme was developed by modifying the computer code of the MOUSE software packag...
Article
Full-text available
The application of hydroinformatics tools is restricted in developing countries due to the non-availability of the required data and information under local conditions. This paper presents the state of water quality of the city of Vientiane (capital of Lao PDR) before the extensive rectification of its drainage network and describes an approach and...
Conference Paper
Full-text available
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Article
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Many cities in developing countries are typified by large areas of informal settlements. These often do not adhere to official planning guidelines, building regulations and construction standards and, as they are not officially recognised by local authorities, are rarely provided with adequate infrastructure and services. The provision of improved...
Conference Paper
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The following values have no corresponding Zotero field: CY - Nice, France ID - 9 , The following values have no corresponding Zotero field: CY - Nice ID - 59
Article
Full-text available
Urban Authorities must take greater steps to address flood related problems and adopt an integrated approach to have an efficient stormwater management. One approach is to restrict construction in areas that are at high risk from flooding, such as on flood plains. It is necessary to consider alternative approaches for the control of developments on...
Article
Full-text available
This paper presents the general concepts and elements of integrated water resources management and the status of their adoption in Bangladesh at the national level. It describes the situation of the country with respect to the duality in the seasonal pattern of rainfall, the geographic position and the topography, which are the main constraints to...
Chapter
Modeling of water quality in sewers emerged during the late 1990s. The water quality and amount of water in sewers are dominant factors for designing wastewater treatment plants and for analyzing water quality impacts from sewer overflows. In addition, sewage under anaerobic conditions may cause corrosion of pipes, malodors, and pose health risks f...
Chapter
The construction and operation of urban drainage and stormwater systems have historically been driven by the objectives of maintaining public hygiene and preventing flooding. All over the world, cities have grown rapidly during the last century, and city authorities have built and continuously expanded storm and wastewater drainage facilities. Many...
Chapter
Flooding in urban areas is an inevitable problem in many cities, and it causes huge costs to the society in structural and nonstructural damage. The problems that arize from urban flooding range from minor ones such as water getting into the basement of a few houses, to major incidents, where large parts of cities are inundated for several days. Mo...
Chapter
Full-text available
Nowadays, many organizations collect hydrologic information for various purposes. But still, little information from the huge sources of data is made public in real time, and only a small fraction of the data is applied for real-time decision making. Once the hydrologic data have become “historical” (the data are no longer applicable for real-time...