Multiple drift responses of benthic invertebrates to interacting hydropeaking and thermopeaking waves

  title={Multiple drift responses of benthic invertebrates to interacting hydropeaking and thermopeaking waves},
  author={M. Bruno and A. Siviglia and M. Carolli and B. Maiolini},
Sudden instream releases of hypolimnetic water from hydropower plants [i.e. hydropeaking (HP)] can cause abrupt temperature variations [i.e. thermopeaking (TP)], typically on a daily basis. The propagation of discharge and thermal waves is asynchronous, causing the benthic community to undergo two different but consecutive impacts. Invertebrates respond to sudden increases in discharge with catastrophic drift, and respond to sudden changes of temperature with behavioural drift. Owing to the… Expand
Behavioral response of the freshwater cyclopoid copepod Eucyclops serrulatus to hydropeaking and thermopeaking in a laboratory flume
ABSTRACT The generation of electricity by hydropower plants meets the requirements for intermittent energy demand and for the production of renewable energy. However, the hydropower plant operationExpand
Effects of hydro- and thermopeaking on benthic macroinvertebrate drift.
The results confirm a significant loss of limnophilic macroinvertebrate taxa following hydraulic stress and imply that river restoration projects must address the hydrological regime and, if necessary need to include suitable management schemes for hydropower plants. Expand
Hydropeaking Impacts and Mitigation
Flow is a major driver of processes shaping physical habitat in streams and a major determinant of biotic composition. Flow fluctuations play an important role in the survival and reproductiveExpand
Macroinvertebrate Recovery to Varying Hydropeaking Frequency: A Small Hydropower Plant Experiment
As the demand for hydroelectricity progresses worldwide, small hydropower operators are increasingly examining the feasibility of using existing infrastructure (e.g., settling basins) inExpand
Characterization of sub‐daily thermal regime in alpine rivers: quantification of alterations induced by hydropeaking
The thermal regime of rivers is threatened by anthropogenic stresses at a large variety of timescales. We focus on sub-daily thermal alterations induced by the release of hypolimnetic water forExpand
Effects of hydropeaking waves’ offsets on growth performances of juvenile Salix species
Hydropower production and other human activities change the natural flow regime of rivers (e.g., hydropeaking effects), in turn, impacting the riparian environment. Here we present an experimentExpand
Settling distances of benthic invertebrates in a sediment mobilization simulation in semi-natural flumes
It is shown that entrained EPT nymphs travel only short distances before returning to the substratum, and that the actual distance travelled while drifting and the total time spent in drift varies between species. Expand
Thermal implications of hydropeaking activity in regulated Arctic rivers
River temperature is an influential variable for biologic activity in arctic rivers. Regulated discharge regimes can have significant impacts on water temperature on both short and long time scalesExpand
Consistent but secondary influence of hydropeaking on stream fish assemblages in space and time
Abstract Hydropeaking corresponds to rapid artificial discharge variations, designed to address sub-daily peaks in electricity demand. It generates rapid changes in physical habitat (e.g., flowExpand
The effects of hydropeaking on hyporheic interactions based on field experiments
Hydropeaking power production has the potential to pose serious challenges towards hydrology, water quality and ecology in the downstream water bodies. The effects of such abrupt changes of flow inExpand


Short time-scale impacts of hydropeaking on benthic invertebrates in an Alpine stream (Trentino, Italy)
The temporal pattern and drift composition corresponded well with those reported in literature, and indicate that repeated high-flow events of similar magnitude cause considerable losses from benthic populations to drift. Expand
Influence of intermittent hydropeaking on the longitudinal zonation patterns of benthic invertebrates in a mountain stream
The longitudinal zonation patterns of invertebrate species were studied in the River Oriege (Pyrenees, France) from 920 to 819 m a.s.l. At 912 m a.s.l., the river receives hypolimnetic water divertedExpand
Influence of hydropeaking on the distribution and larval development of the plecoptera from a mountain stream
The downstream distribution and larval development of the Plecoptera from a Pyrenean stream were studied upstream and downstream of a hydroelectric power plant with intermittent hypolimneticExpand
Immediate and habitat-specific responses of macroinvertebrates to sequential, experimental floods
Abstract Spatial and temporal patterns of transported organic matter (seston) and macroinvertebrates (drift) and benthic macroinvertebrate densities were examined before, during, and shortly afterExpand
Drift and benthic population structure of the mayfly Rhithrogena semicolorata (Heptageniidae) under natural and hydropeaking conditions
The diel patterns in the drift density and size-structure of the heptagenid mayfly Rhithrogena semicolorata under natural and intermittent hydropeaking conditions in a mountain stream showed a shift towards larger individuals in the size-composition of the benthic populations. Expand
When is stream invertebrate drift catastrophic? The role of hydraulics and sediment transport in initiating drift during flood events
Summary 1. The term ‘catastrophic drift’ is used to describe the large-scale displacement of invertebrates that occurs during periods of increased river discharge. However, the physical processesExpand
Influence of hypolimnetic hydropeaking on the distribution and population dynamics of Ephemeroptera in a mountain stream
SUMMARY 1. The Ephemeroptera assemblage of the River Oriege (Pyrenees, France) was studied up- and downstream of a hydroelectric power plant with hypolimnetic releases from a nearby high altitudeExpand
Thermopeaking in Alpine streams: event characterization and time scales
The present study provides a detailed quantification of the "thermopeaking" phenomenon, which consists of sharp intermittent alterations of stream thermal regime associated with hydropeaking releasesExpand
Longitudinal effects of experimental floods on stream benthos downstream from a large dam
We examined the longitudinal effects of 3 experimental floods on seston, periphyton, and macroinvertebrates in a regulated river downstream from a large reservoir in the Swiss Alps. In addition,Expand
Review of Ecological Effects of Rapidly Varying Flows Downstream from Hydroelectric Facilities
Abstract Rapid changes in flow below hydroelectric facilities result from peaking operations, where water is typically stored in a reservoir at night and released through turbines to satisfyExpand