Hydro-geo-chemical streamflow analysis as a support for digital hydrograph filtering in a small, rainfall dominated, sandstone watershed

Longobardi, Antonia; Villani, Paolo; Guida, Domenico; Cuomo, Albina

doi:10.1016/j.jhydrol.2016.05.028

Cited by 26 publications

(27 citation statements)

References 30 publications

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“…When water quality data are available through routine sampling campaigns, or dedicated experiments, it can be used to calibrate digital filters. It is recommended that high frequency water quality data are used in a number of sites in the catchment to perform the calibration of digital filters (Longobardi et al, ; Zhang et al, ). Once the filter parameters are calibrated, the entire flow time series can be used to derive a similar time series of baseflow, such as in the study of Zhang et al ().…”

Section: Discussionsupporting

confidence: 85%

“…The analysis of water quality data revealed that EC was a suitable tracer to perform hydrograph separation for the Kaap catchment. This is in line with several authors who have used high frequency and discrete time series of EC to perform hydrograph separation and quantify baseflow at a daily timescale (Longobardi et al, ; Miller et al, ; Miller et al, ; Zhang et al, ). For example, Miller et al () used discrete EC data sets to quantify baseflow contributions in the Upper Colorado basin, using hydrograph separation.…”

Section: Discussionmentioning

confidence: 99%

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Hydrograph separation using tracers and digital filters to quantify runoff components in a semi‐arid mesoscale catchment

Okello

Uhlenbrook

Jewitt

et al. 2018

Hydrological Processes

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Chemical hydrograph separation using electrical conductivity and digital filters is applied to quantify runoff components in the 1,640 km2 semi‐arid Kaap River catchment and its subcatchments in South Africa. A rich data set of weekly to monthly water quality data ranging from 1978 to 2012 (450 to 940 samples per site) was analysed at 4 sampling locations in the catchment. The data were routinely collected by South Africa's national Department of Water and Sanitation, using standard sampling procedures. Chemical hydrograph separation using electrical conductivity (EC) as a tracer was used as reference and a recursive digital filter was then calibrated for the catchment. Results of the two‐component hydrograph separation indicate the dominance of baseflow in the low flow regime, with a contribution of about 90% of total flow; however, during the wet season, baseflow accounts for 50% of total flow. The digital filter parameters were very sensitive and required calibration, using chemical hydrograph separation as a reference. Calibrated baseflow estimates ranged from 40% of total flow at the catchment outlet to 70% in the tributaries. The study demonstrates that routinely monitored water quality data, especially EC, can be used as a meaningful tracer, which could also aid in the calibration of a digital filter method and reduce uncertainty of estimated flow components. This information enhances our understanding of how baseflow is generated and contributed to streamflow throughout the year, which can aid in quantification of environmental flows, as well as to better parameterize hydrological models used for water resources planning and management. Baseflow estimates can also be useful for groundwater and water quality management.

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Hydrograph separation using tracers and digital filters to quantify runoff components in a semi‐arid mesoscale catchment

Okello

Uhlenbrook

Jewitt

et al. 2018

Hydrological Processes

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“…Recently, following these considerations and in order to overcome the aforementioned issues, Longobardi et al . () proposed an integrated approach, using the mass balance approach to constrain the parameters for the application of the digital recursive filter method on the data from the Ciciriello catchment.…”

Section: Discussionmentioning

confidence: 99%

“…More recently, Jones et al (2006), Sudicky et al (2007) and Park et al (2011) have considered that the mass balance equations do not adequately account for hydrodynamic dispersion processes that can inflate the groundwater contributions, and they are looking to using the mass balance equation in conjunction with artificial and isotopic tracers or digital filters. Recently, following these considerations and in order to overcome the aforementioned issues, Longobardi et al (2016) proposed an integrated approach, using the mass balance approach to constrain the parameters for the application of the digital recursive filter method on the data from the Ciciriello catchment.…”

Section: Discussionmentioning

confidence: 99%

Using hydro-chemograph analyses to reveal runoff generation processes in a Mediterranean catchment

Cuomo

Guida

2016

Hydrol. Process.

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The paper deals with the hydro‐chemical analysis performed in order to reveal processes, sources, paths and timing of the runoff generation in an experimental catchment representative of the hilly, terrigenous and forested watershed in the Mediterranean humid eco‐region of southern Italy. The analysis is based on the data recorded at the outlet of the catchment during 2013–2014. A mixing law procedure was applied on discharge (Q) and electrical conductivity (EC) data, by using the Q–EC end members previously collected at selected groundwater, sub‐surficial and surficial stations. In this way, we found four bound curves delimiting fields in a Q–EC plot, each with hydro‐chemograph value ranges. At annual time scale, the analysis revealed a seasonal behaviour of the hydrological response, different for the wet period, when the aquifer is recharging, and the dry periods, when the aquifer is discharging, despite frequent summer rain showers. At event time scale, the catchment seems to show the behaviour of a typical hydro‐geomorphic threshold system. We interpreted this behaviour as due to a progressive addition of water from distinctive components (i.e. deep aquifer, riparian corridor, hillslope and hollow), each with originally different mechanisms of runoff production (i.e. groundwater, groundwater ridging, saturation excess, infiltration excess and soil pipe exfiltration) and response time. During the event, the contributing areas enlarge upward the riparian corridors and the zero‐order basins, where the aforementioned components become superposed and the mechanisms interact more and more. We hypothesize that the threshold values between different states of the system are defined by the intersections of the boundary curves on the Q–EC plot. Different patterns in the Q–EC hysteretic cycles are prevalently related to the pre‐event soil saturation and groundwater contributions to stormflow and recharge mechanisms. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Each procedure is, to a large extent, arbitrary (Hewelett & Hibbert, ) but provides a repeatable methodology to derive objective measures or indices related to a particular streamflow source. Recursive digital filters (RDFs) are the most commonly used methods for estimating baseflow because of their simplicity and quick implementation, which only needs streamflow data (Aksoy, Kurt, & Eris, ; Eckhardt, ; Li, Maier, Partington, Lambert, & Simmons, ), even though RDF parameters are questionable in certain cases, and geochemical or isotopic method calibration would improve the separation between slow and fast components (Lott & Stewart, ; Longobardi, Villani, Guida, & Cuomo, ). Among RDFs, the Lyne and Hollick method (Ladson, Brown, Neal, & Nathan, ; Lyne & Hollick, ) seemed to be the most flexible approach and to have better performance for a wide range of climate conditions and catchment properties (Li et al, ; Longobardi, Villani, et al, ).…”

Section: Bfi Assessment For Observed Catchmentsmentioning

confidence: 99%

Assessing baseflow index vulnerability to variation in dry spell length for a range of catchment and climate properties

Longobardi

Loon

2018

Hydrological Processes

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Baseflow index (BFI) prediction in ungauged basins has largely been based on the use of catchment physiographic attributes as dominant variables. In a context where changes in climate are increasingly evident, it is also important to study how the slow component of flow is potentially affected by climate. The aim of this study was to illustrate the impact of climate variability on the baseflow process based on analysis of daily rainfall characteristics and hydrological modelling simulation exercises validated with observed data. Ten catchments were analysed that span southern to northern Europe and range from arid Mediterranean to maritime temperate climate conditions. Additionally, more than 2,000 virtual catchments were modelled that cover an extended gradient of physiographic and climate properties. The relative amounts of baseflow were summarized by the BFI. The catchment slow response delay time (Ks) was assumed to be a measure of catchment effects, and the impact of climate properties was investigated with the dry spell length (d). Well‐drained and poorly‐drained groups were identified based on Ks and d, and their response to an increase or decrease in dry spell length was analysed. Overall, for either well‐ or poorly‐drained groups, an extension in dry spell length appeared to have minor effects on the baseflow compared with a decrease in dry spell length. Under the same dry spell variation, the BFI vulnerability appeared higher for catchments characterized by large initial d values in combination with poorly‐drained systems, but attributing an equal weight to the variations in d both in the case of dry and wet initial conditions, it is in the end concluded that the BFI vulnerability appears higher for systems laying in the transition zone between well‐ and poorly‐drained systems.

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Hydro-geo-chemical streamflow analysis as a support for digital hydrograph filtering in a small, rainfall dominated, sandstone watershed

Cited by 26 publications

References 30 publications

Hydrograph separation using tracers and digital filters to quantify runoff components in a semi‐arid mesoscale catchment

Hydrograph separation using tracers and digital filters to quantify runoff components in a semi‐arid mesoscale catchment

Using hydro-chemograph analyses to reveal runoff generation processes in a Mediterranean catchment

Assessing baseflow index vulnerability to variation in dry spell length for a range of catchment and climate properties

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