Joost van Summeren

KWR Water Research Institute

Discolouration events in drinking water distribution networks occur because of accumulation of particulate material in pipes and subsequent remobilization during hydraulic events. Cleaning actions and quality improvements at water treatment plants are partly successful in reducing discolouration risks. In Dutch distribution systems the implementati...

Traditional approaches to optimal water quality sensor placement in drinking water distribution networks can be limiting, because they are oriented towards obtaining information and mitigating effects. Approaches optimizing the utility’s response to contamination merit wider study and application. The performance of these different approaches is st...

Discoloration of drinking water is a worldwide phenomenon caused by accumulation and subsequent remobilization of particulate matter in drinking water distribution systems (DWDSs). It contributes a substantial fraction of customer complaints to water utilities. Accurate discoloration risk predictions could improve system operation by allowing for m...

To investigate transport of drinking water in topologically complex distribution networks and associated monitoring problems, experimental facilities can provide a relevant complement to numerical models and living laboratoriess or playgrounds. An experimental facility was designed which is a scale model of an existing supply zone serving ~100,000...

Discoloration of drinking water is a worldwide phenomenon caused by accumulation and subsequent remobilization of particulate matter in distribution systems (DWDSs). It contributes to a substantial fraction of customer complaints to water utilities. Accurate discoloration risk predictions could improve system operation by allowing for more effectiv...

Methods to improve the operational efficiency of a water supply network by early detection of anomalies are investigated by making use of the data streams from multiple sensor locations within the network. The water supply network is a demonstration site of Vitens, a Dutch water company that has several district metering areas where flow, pressure,...

Discoloration of drinking water is a common reason for customers to file reports to water companies, but the complexity of the problem makes it difficult to reduce discoloration risk. In this paper, we investigated possible relations between discoloration-related customer reports and temperature, two network design diagnostics, pipe diameter, lengt...

We used a thermal model of an iron core to calculate magnetodynamo evolution in Earth-mass rocky planets to determine the sensitivity of dynamo lifetime and intensity to planets with different mantle tectonic regimes, surface temperatures, and core properties. The heat flow at the core-mantle boundary (CMB) is derived from numerical models of mantl...

Earth's subducting plates move 3-4 times faster than its overriding plates, but it remains unclear whether these contrasting plate speeds are caused by additional pull from subducting slabs or by increased viscous drag on the lithosphere-asthenosphere boundary beneath deeply-protruding continental roots. To investigate the relative importance of pl...

Magnetic fields on terrestrial exoplanets can provide valuable constraints on the internal structure and dynamics of these planets, protect planetary atmospheres against stellar wind erosion, and shield planetary surfaces from charged particles. Many recently discovered exoplanets are on close-in orbits and this promotes tidal locking and must caus...

Global patterns of plate motions provide a constraint on plate tectonic forces and mantle structure, but the relative importance of plausible driving and resisting forces has not yet been determined. To help disentangle the various controls of Earth's plate motions, we constructed numerical models that combine (i) lateral viscosity variations assoc...

Recently discovered exoplanets on close-in orbits should have surface temperatures of 100's to 1000's of K. They are likely tidally locked and synchronously rotating around their parent stars and, if an atmosphere is absent, have surface temperature contrasts of many 100's to 1000's K between permanent day and night sides. We investigated the effec...

We investigated mantle convective structures and tectonic settings for synchronously rotating exoplanets on close-in orbits around their parent stars. Our study is motivated by the possibility that extreme variations in surface temperature affect these planets' interior dynamics and related surface expressions. Exoplanets on orbits 1000K) temperatu...

Mechanical coupling between the convecting mantle and Earth's lithospheric plates determines how buoyancy forces within the deep mantle are expressed at the surface as plate motions and lithospheric stresses. Strong viscosity variations associated with deeply-penetrating continental roots have been shown to significantly modify this plate-mantle co...

With numerical modelling experiments we examine the influence of the 660 km post-spinel phase tran- sition on the excess temperatures in and transport of compositional heterogeneity by deep mantle upwellings. We test our results against available observations on ocean island basalts (OIB). The endother- mic post-spinel transition can cause localise...

In modern geoscience, mounting evidence in support of large-scale lateral variations in the composition of Earth's deep mantle has fueled the debate on the structure and evolution of mantle convection. Seismological data supports the view that material transport across the mantle transition zone is significant. On the other hand, complete homogenis...

Over the past decade, seismic tomography has revealed that subducting lithospheric slabs interact with the transition zone in a variety of ways, directly penetrating into the lower mantle in some locations, while stagnating in others. Here, we present preliminary results of attempts to characterize and quantify the stagnation of slab material in th...

Seismic tomography is providing mounting evidence for large scale compositional heterogeneity deep in Earth’s mantle, and also the diverse geochemical and isotopic signatures observed in oceanic basalts suggest that the mantle is not chemically homogeneous. Isotopic studies on Archean rocks indicate that mantle inhomogeneity may have existed for mo...

The concept of a compositional heterogenous reservoir, in the deep lower mantle, has become increasingly popular in recent years, due to indications from seismology, geochemistry and heat budget calculations. In this study, the dynamic feasibility of this concept was investigated, using numerical modeling techniques. We applied 2-D cartesian and cy...