Sediment and nutrient behaviour on the River Bandon, Ireland

Harrington, Joseph; Harrington, S. T.

doi:10.2495/rbm130181

Cited by 1 publication

(3 citation statements)

References 7 publications

(6 reference statements)

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“…This means each recorded data point is the average of 60 scans over 15 min. The turbidity data is calibrated with manual and automatic sampling [5][6][7][8]. In the case of model simulations, these are taken each 15 min, except for the bed shear stress model, for which, due to the numerical conditions (courant number < 0.5), the simulation period is 5 s. This data was evaluated by Park [11] using a slope-break analysis which proposed that for the River Bandon, the critical flowrate, Qc, should be adopted as 10 m 3 /s.…”

Section: Methodsmentioning

confidence: 99%

“…Compliance with the European Union Water Framework Directive, the Freshwater Fish Directive, and the Habitats Directive requires the monitoring and modeling of fine sediment behavior and concentrations in riverine systems. Modeling provides an understanding of the dynamics of suspended sediment flux and allows the study of impacts of fine sediments on, for example, riverine fish populations [1][2][3][4][5][6]. Different types of model are commonly used to quantify the suspended sediment concentration, SSC, in gravel-bed rivers.…”

Section: Introductionmentioning

confidence: 99%

“…The relationship between suspended sediment concentration, SSC, and fine sediment ingress into gravel bed rivers has been experimentally studied through sediment traps installed in the bed of the stream [13,14]. In general, factors that influence the suspended sediment load during storm events have been extensively studied in recent decades, although much effort is still needed to provide models with the capacity to predict the SSC with low uncertainty indices [5][6][7][8][15][16][17].…”

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confidence: 99%

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Fine Sediment Modeling During Storm-Based Events in the River Bandon, Ireland

García

Harrington

2019

Water

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The River Bandon located in County Cork (Ireland) has been time-continuously monitored by turbidity probes, as well as automatic and manual suspended sediment sampling. The current work evaluates three different models used to estimate the fine sediment concentration during storm-based events over a period of one year. The modeled suspended sediment concentration is compared with that measured at an event scale. Uncertainty indices are calculated and compared with those presented in the bibliography. An empirically-based model was used as a reference, as this model has been previously applied to evaluate sediment behavior over the same time period in the River Bandon. Three other models have been applied to the gathered data. First is an empirically-based storm events model, based on an exponential function for calculation of the sediment output from the bed. A statistically-based approach first developed for sewers was also evaluated. The third model evaluated was a shear stress erosion-based model based on one parameter. The importance of considering the fine sediment volume stored in the bed and its consolidation to predict the suspended sediment concentration during storm events is clearly evident. Taking into account dry weather periods and the bed erosion in previous events, knowledge on the eroded volume for each storm event is necessary to adjust the parameters for each model. This is achieved by predicting three points of the SSC-time curve: the maximum concentration, C max ; the time to the peak concentration, TPE; and the time from descent from the peak concentration, TDE. From these three points, exponential and logarithmic curves are proposed to represent the complete curve. Other classical models [9,10] are based on shear stress values in the bed, proportional to the bed erosion transported due to the streamflow. These models based on shear stress use an erosion rate, M, with erosion commencing when a critical value of shear stress, τ c , is exceeded. Other authors have previously studied storm events to quantify the fine sediment transport within a reach in a gravel bed river [11,12] through field measurements, considering important aspects such as sediment storage in the mainstream channel and its evolution during inter-event periods. The relationship between suspended sediment concentration, SSC, and fine sediment ingress into gravel bed rivers has been experimentally studied through sediment traps installed in the bed of the stream [13,14]. In general, factors that influence the suspended sediment load during storm events have been extensively studied in recent decades, although much effort is still needed to provide models with the capacity to predict the SSC with low uncertainty indices [5][6][7][8][15][16][17].

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