Fathoming the hydrosphere (Henry Darcy Medal Lecture)

Water ManagementCivil Engineering and Geoscience

Human activities have changed the shapes of river deltas

A model has been devised that quantitatively describes how the shape of a river delta is affected by sediments, tides and waves. It reveals that the area of delta land is increasing globally, as a result of human activities upstream.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Water Resource

Polders

These lecture notes are part of the course entitled ‘Polders’ given in the academic year 2014-2015 by the Water Resources Section of the faculty of Civil Engineering, Delft University of Technology.Civil Engineering and GeosciencesHydraulic Engineerin

Energy balance measurements over a small reservoir in Ghana's upper east region

Water ManagementCivil Engineering and Geoscience

Using a spatio-temporal dynamic state-space model with the EM algorithm to patch gaps in daily riverflow series

International audienceA spatio-temporal linear dynamic model has been developed for patching short gaps in daily river runoff series. The model was cast in a state-space form in which the state variable was estimated using the Kalman smoother (RTS smoother). The EM algorithm was used to concurrently estimate both parameter and missing runoff values. Application of the model to daily runoff series in the Volta Basin of West Africa showed that the model was capable of providing good estimates of missing runoff values at a gauging station from the remaining time series at the station and at spatially correlated stations in the same sub-basin

Temperature Dynamics Investigation At Small And Shallow Lakes Using Hydrodynamic Model

A three-dimensional time-dependent hydrodynamic and heat transport model of Lake Binaba, a shallow and small dam reservoir in Ghana, emphasizing the simulation of dynamics and thermal structure has been developed. Most numerical studies of temperature dynamics in reservoirs are based on one- or two-dimensional models. These models are not applicable for reservoirs characterized with complex flow pattern and unsteady heat exchange between the atmosphere and water surface. Continuity, momentum and temperature transport equations have been solved. Proper assignment of boundary conditions, especially surface heat fluxes, has been found crucial in simulating the lake’s hydrothermal dynamics. This model is based on the Reynolds Average Navier-Stokes equations, using a Boussinesq approach, with a standard k − ε turbulence closure to solve the flow field. The thermal model includes a heat source term, which takes into account the short wave radiation and also heat convection at the free surface, which is function of air temperatures, wind velocity and stability conditions of atmospheric boundary layer over the water surface. The governing equations of the model have been solved by OpenFOAM; an open source, freely available CFD toolbox. As its core, OpenFOAM has a set of efficient C++ modules that are used to build solvers. It uses collocated, polyhedral numerics that can be applied on unstructured meshes and can be easily extended to run in parallel. A new solver has been developed to solve the hydrothermal model of lake. The simulated temperature was compared against a 15 days field data set. Simulated and measured temperature profiles in the probe locations show reasonable agreement. The model might be able to compute total heat storage of water bodies to estimate evaporation from water surface. INTRODUCTION InalndWater Resource

Dense distributed temperature sensing to infer local seepage fluxes in coastal areas

Water ManagementCivil Engineering and Geoscience

Modeling of over lake wind profile for estimating water surface evaporation using land-based meteorological data

Water ManagementCivil Engineering and Geoscience

Say it in 51 bytes: LoRa for hydrological observations

Water Resource

Lighnting detection and tracking with consumer electronics

Water ManagementCivil Engineering and Geoscience