Detecting groundwater discharge dynamics from point-to-catchment scale in a lowland stream: combining hydraulic and tracer methods
Reads0
Chats0
TLDR
In this article, the authors combine hy- draulic and tracer methods from point-to-catchment scale to assess the temporal and spatial variability of groundwater discharge in a lowland, groundwater gaining stream in Den- mark.Abstract:
Detecting, quantifying and understanding ground- water discharge to streams are crucial for the assess- ment of water, nutrient and contaminant exchange at the groundwater-surface water interface. In lowland agricultural catchments with significant groundwater discharge this is of particular importance because of the risk of excess leach- ing of nutrients to streams. Here we aim to combine hy- draulic and tracer methods from point-to-catchment scale to assess the temporal and spatial variability of groundwater discharge in a lowland, groundwater gaining stream in Den- mark. At the point-scale, groundwater fluxes to the stream were quantified based on vertical streambed temperature pro- files (VTPs). At the reach scale (0.15-2 km), the spatial dis- tribution of zones of focused groundwater discharge was investigated by the use of distributed temperature sensing (DTS). Groundwater discharge to the stream was quanti- fied using differential gauging with an acoustic Doppler cur- rent profiler (ADCP). At the catchment scale (26-114 km 2 ), runoff sources during main rain events were investigated by hydrograph separations based on electrical conductiv- ity (EC) and stable isotopes 2 H= 1 H. Clear differences in runoff sources between catchments were detected, ranging from approximately 65 % event water for the most respon- sive sub-catchment to less than 10 % event water for the least responsive sub-catchment. This was supported by the groundwater head gradients, where the location of weaker gradients correlated with a stronger response to precipita- tion events. This shows a large variability in groundwater discharge to the stream, despite the similar lowland char- acteristics of sub-catchments indicating the usefulness ofread more
Citations
More filters
Journal ArticleDOI
Using multi-tracer inference to move beyond single-catchment ecohydrology
Benjamin W. Abbott,Viktor Baranov,Clara Mendoza-Lera,Myrto Nikolakopoulou,Astrid Harjung,Tamara Kolbe,Mukundh N. Balasubramanian,Timothy N. Vaessen,Francesco Ciocca,Audrey Campeau,Marcus B. Wallin,Paul Romeijn,Marta Antonelli,José Leonardo de Moraes Gonçalves,Thibault Datry,Anniet M. Laverman,Jean-Raynald de Dreuzy,David M. Hannah,Stefan Krause,Carolyn Oldham,Gilles Pinay +20 more
TL;DR: In this article, the authors synthesize the history of hydrological and biogeochemical theory, summarize modern tracer methods, and discuss how improved understanding of flowpath, residence time, and bio-geochemical transformation can help ecohydrology move beyond description of site-specific heterogeneity.
Journal ArticleDOI
Temperature buffering by groundwater in ecologically valuable lowland streams under current and future climate conditions
TL;DR: In this article, the importance of groundwater for the temperature of two Dutch lowland streams and its possible role in mitigating the effects of climate change was determined by combining field measurements and a modelling experiment.
Journal ArticleDOI
High-resolution monitoring of nutrients in groundwater and surface waters: process understanding, quantification of loads and concentrations, and management applications
TL;DR: In this article, the authors present an overview of the current state of high-resolution monitoring of nutrients and present a new assessment of the objectives behind high-frequency monitoring as classified into three main groups: improved understanding of the underlying hydrological, chemical, and biological processes (PU); quantification of true nutrient concentrations and loads (Q); and operational management, including evaluation of the effects of mitigation measures (M).
Journal ArticleDOI
Application of Distributed Temperature Sensing for coupled mapping of sedimentation processes and spatio‐temporal variability of groundwater discharge in soft‐bedded streams
TL;DR: In this paper, a method is proposed to delineate potential high-groundwater discharge areas and identify deposition-induced temperature anomalies in soft-bedded streams using distributed temperature sensing data.
Journal ArticleDOI
HOBE: The Danish Hydrological Observatory
TL;DR: The Danish hydrological observatory was established in 2007 in a catchment in the western part of Denmark representing water balance conditions in a temperate climate with groundwater-dominated streamflow.
References
More filters
Journal ArticleDOI
A review of catchment experiments to determine the effect of vegetation changes on water yield and evapotranspiration
J.M. Bosch,J.D. Hewlett +1 more
TL;DR: In this paper, a summary and review of 94 catchment experiments shows that accumulated information on the effect of vegetation changes on water yield can be used for practical purposes, since no experiments, with the exception of perhaps one, have resulted in reductions in water yield with reductions in cover, or increases in yield, with increases in cover.
Directive 2000/60/EC of the European Parliament and of The Council of 23 October 2000 establishing a Framework for Community Action in the Field of Water Policy (Water Framework Directive)
TL;DR: The declaration of the Ministerial Seminar on groundwater held at The Hague in 1991 recognised the need for action to avoid long-term deterioration of freshwater quality and quantity and called for a programme of actions to be implemented by the year 2000 aiming at sustainable management and protection of freshwater resources as discussed by the authors.
Journal ArticleDOI
Interactions between groundwater and surface water: the state of the science
TL;DR: In this article, the mechanisms of interactions between groundwater and surface water (GW-SW) as they affect recharge-discharge processes are comprehensively outlined, and the ecological significance and the human impacts of such interactions are emphasized.
Journal ArticleDOI
Choosing appropriate techniques for quantifying groundwater recharge
TL;DR: The reliability of recharge estimates using different tech- niques is variable as mentioned in this paper, and uncertainties in each approach to estimating recharge underscore the need for application of multiple techniques to increase the expected recharge rates at a site.
Journal ArticleDOI
A review of paired catchment studies for determining changes in water yield resulting from alterations in vegetation
TL;DR: In this paper, the authors focus on the use of paired catchment studies for determining the changes in water yield at various time scales resulting from permanent changes in vegetation and highlight the potential underestimation of water yield changes if regrowth experiments are used to predict the likely impact of permanent alterations to a catchment's vegetation.