Twenty-three unsolved problems in hydrology (UPH)–a community perspective

This paper is the outcome of a community initiative to identify major unsolved scientific problems in hydrology motivated by a need for stronger harmonisation of research efforts. The procedure involved a public consultation through online media, followed by two workshops through which a large number of potential science questions were collated,...

Rainfall-runoff modelling using river-stage time series in the absence of reliable discharge information: A case study in the semi-arid Mara River basin

Hydrological models play an important role in water resources management. These models generally rely on discharge data for calibration. Discharge time series are normally derived from observed water levels by using a rating curve. However, this method suffers from many uncertainties due to insufficient observations, inadequate rating curve...

Can flow velocity distribution at a pore-scale be quantified by a celerity-saturation curve?

What can flux tracking teach us about water age distribution patterns and their temporal dynamics?

The complex interactions of runoff generation processes underlying the hydrological response of streams remain not entirely understood at the catchment scale. Extensive research has demonstrated the utility of tracers for both inferring flow path distributions and constraining model parameterizations. While useful, the common use of linearity...

What can flux tracking teach us about water age distributions and their temporal dynamics?

The complex interactions of runoff generation processes underlying the hydrological response of streams remain incompletely understood at the catchment scale. Extensive research has demonstrated the utility of tracers for both inferring flow paths distributions and constraining model parameterizations. While useful, the common use of linearity...

Quantifying hyporheic exchange at high spatial resolution using natural temperature variations along a first?order stream

Hyporheic exchange is an important process that underpins stream ecosystem function, and there have been numerous ways to characterize and quantify exchange flow rates and hyporheic zone size. The most common approach, using conservative stream tracer experiments and 1?D solute transport modeling, results in oversimplified representations of the...

On the value of combined event runoff and tracer analysis to improve understanding of catchment functioning in a data-scarce semi-arid area

Quantifying spatial and temporal discharge dynamics of an event in a first order stream, using distributed temperature sensing

Hydrograph separation and scale dependency of natural tracers in a semi-arid catchment