
Reynold ChowWageningen University & Research | WUR · Department of Soil Physics and Land Management
Reynold Chow
Dr. rer. nat.; P.Geo. (ON,BC)
Seeking Hydro(geo)logic Research Collaborations
About
33
Publications
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Introduction
Reynold currently works at the Department of Geosciences, University of Tübingen and Department of Stochastic Simulation and Safety Research for Hydrosystems, University of Stuttgart.
Reynold is a hydrogeologist with experience in hydrogeologic site investigations, including core logging, packer testing, monitoring well installations, and hydraulic response testing (i.e., slug tests, pumping tests). He has worked for mining clients with projects in Northern British Columbia, the Alberta Oil Sands, Yukon Territory and Alaska.
Reynold is also experienced in numerical groundwater modelling, and has comprehensive knowledge of MODFLOW (Visual MODFLOW & Groundwater Vistas), Surfer, and Grapher in addition to experience using FeFlow, Watflow, and HydroGeoSphere.
Additional affiliations
Education
September 2009 - June 2012
September 2003 - December 2008
Publications
Publications (33)
Study region: Verlorenvlei Catchment (~1 890 km2) is an agriculture-dominated area (~43 % per km2) on South Africa’s west coast. This semi-arid region has variable rainfall and high evaporation rates, affecting the three major aquifers and Verlorenvlei – a RAMSAR-listed estuarine lake.
Study focus: Natural processes (i.e., extended dry periods and...
The WC has become increasingly dependent on groundwater in recent years due to repeated droughts. A framework to monitor the regional groundwater levels is urgently required to sustainably manage the WC’s water resources, since the region has inconsistent or unavailable monitoring data. Therefore, this study aims to understand how Gravity Recovery...
An inadvertent consequence of pesticide use is aquatic pesticide pollution, which has prompted the implementation of mitigation measures in many countries. Water quality monitoring programs are an important tool to evaluate the efficacy of these mitigation measures. However, large interannual variability of pesticide losses makes it challenging to...
Aquatic pesticide pollution is an important issue worldwide. Countries rely on monitoring programs to observe water bodies quality and on models to evaluate pesticide risks for entire stream networks. Measurements are typically sparse and discontinuous which lead to issues in quantifying pesticide transport at the catchment scale. Therefore, it is...
The Western Cape in South Africa has a Mediterranean climate, which has in part led to an abundance of agriculturally productive land supporting the wheat, deciduous fruit, wine, and citrus industries. South Africa is the leading pesticide user in Sub-Saharan Africa. There is limited data on the pesticide pollution of surface water over different s...
Tuesday (22 March) is World Water Day with National Water Week being celebrated from 21-27 March. In an opinion piece for Cape Times, Ritshidze Nenweli and Reynold Chow (Department of Earth Sciences) write why the sustainable management of South Africa's groundwater resources is critical to the country's future.
Our study uses regional-scale maps to quantify carbon storage and sequestration from different land use types to evaluate the effects of future land use scenarios. We developed an integrated modeling approach to assess the spatiotemporal impacts of land use/cover change (LUCC) on the provision and value of the carbon storage and sequestration durin...
Agriculture is an essential sector to South Africa’s economy, which has made it the leading user of pesticides in Sub-Saharan Africa. Consequently, there is an urgent need to better understand how pesticides could be entering non-target environments, particularly water where it could potentially affect aquatic ecosystems and human health.
Our curr...
Bedrock rivers represent a hydrogeological environment in which surface water flows along an exposed bedrock surface. Studies of hyporheic exchange have exclusively involved rivers composed of unconsolidated fluvial sediments, leaving a critical knowledge gap. This study evaluates the conditions that could support bedform‐scale hyporheic exchange w...
Aquatic pesticide pollution from both agricultural and urban pest control is a concern in many parts of the world. Making an accurate assessment of pesticide exposure is the starting point to protecting aquatic ecosystems. This in turn requires the design of an effective monitoring program. Monitoring is also essential to evaluate the efficacy of m...
Bedrock rivers represent a hydrogeological environment in which surface water flows along an exposed bedrock surface. Studies of hyporheic exchange have exclusively involved rivers comprised of unconsolidated fluvial sediments, leaving a critical gap in our understanding of groundwater-surface water interactions.
Our study evaluates the conditions...
Hyporheic exchange is the interaction of river water and groundwater, and is difficult to predict. One of the largest contributions to predictive uncertainty for hyporheic exchange has been attributed to the representation of heterogeneous subsurface properties. Our study evaluates the trade-offs between intrinsic (irreducible) and epistemic (reduc...
The choice of data periods for calibrating and evaluating conceptual hydrological models often seems ad-hoc, with no objective guidance on choosing calibration periods that produce the most reliable predictions. We therefore propose to systematically investigate the effects of calibration and validation data choices on parameter identification and...
Download and open .gif in web browser to watch a surface water-groundwater interaction transport simulation of a conservative tracer within a bedrock river (Realization no. 23).
The effects of river channel characteristics on hydrostatic and hydrodynamic pressure variations that drive hyporheic exchange have been the focus of numerous studies over the past decade. The hydrogeological settings of such studies have exclusively considered alluvial rivers, where the riverbed contains layers of unconsolidated fluvial sediment....
Modelling hyporheic exchange processes at relevant scales is important in deepening our understanding of this complex phenomenon. One model aspect readily identified as contributing significantly to the predictive uncertainty of hyporheic exchange is the accurate representation of river bathymetry. Our study determines the aspects of river bathymet...
This study determines the aspects of river bathymetry that have the greatest influence on the predictive biases when simulating hyporheic exchange. To investigate this, we build a highly parameterized HydroGeoSphere model of the Steinlach River Test Site in southwest Germany as a reference. This model is then modified with simpler bathymetries, eva...
Hyporheic exchange is the interaction of water between rivers and groundwater, and is difficult to predict. One of the largest contributions to predictive uncertainty for hyporheic fluxes have been attributed to the representation of heterogeneous subsurface properties. This research aims to evaluate which aspect of the subsurface representation-th...
A hydrogeologic modelling study of the Steinlach River bend, in Southwest Germany, was conducted to assess the predictive uncertainty of hyporheic exchange. The Steinlach River bend is an experimental site established in 2010 to monitor hyporheic exchange fluxes through a river bend (Osenbrück et al., 2013). One aspect of hydrogeologic models most...
This study addresses the delineation of areas that contribute baseflow to a stream reach, also known as stream capture zones. Such areas can be delineated using standard well capture zone delineation methods, with three important differences: (1) natural gradients are smaller compared to those produced by supply wells and are therefore subject to g...
A hydrogeologic modelling study of the Steinlach River bend, in Southwest Germany, was conducted to assess the predictive uncertainty of hyporheic exchange. The Steinlach River bend is an experimental site established in 2010 to monitor hyporheic exchange fluxes through a river bend (Osenbrück et al., 2013). One aspect of hydrogeologic models most...
This study addresses the delineation of areas that contribute baseflow to a stream reach, also known as stream capture zones. Such areas can be delineated using standard well capture zone delineation methods, with three important differences: (1) natural gradients are smaller compared to those produced by supply wells and are therefore subject to g...
This study addresses the delineation of areas that contribute baseflow to a stream reach, also known as stream capture zones. Such areas can be delineated using standard well capture zone delineation methods, with three important differences: (1) natural gradients are smaller compared to those produced by supply wells and are therefore subject to g...
Prioritizing Major Predictive Uncertainty Sources in Coupled Hydrosystem Models
This study extends the methodology for the delineation of capture zones to base flow contribution areas for stream reaches under the assumption of constant average annual base flow in the stream. The methodology is applied to the Alder Creek watershed in southwestern Ontario, using three different numerical models. The three numerical models chosen...
The protection of water sources requires the delineation of well capture zones. Environmentally sensitive features such as wetlands and streams also require protection, and in principle, capture zones can be delineated using the same methodology as that used for well capture zones. In this study, different models are applied to delineate capture zo...
The protection of water sources requires the delineation of well capture zones. Environmentally sensitive features such as wetlands and streams also require protection, and in principle, capture zones can be delineated using the same methodology as that used for well capture zones. In this study, different models are applied to delineate capture zo...
The protection of water supply wells requires the delineation of well capture zones. Environmentally sensitive features such as wetlands and streams also require protection, and in principle, models used for the delineation of well capture zones should be applicable for this purpose also. In this study, different models are applied to delineate cap...