In rivers and streams, CO2 is continuously produced by the metabolism of microorganisms living on their riverbeds. Studies show that, CO2 dissolved in streams, is gradually and naturally released into the atmosphere in cases where the riverbed is regular, at dips of even a few centimeters instead a considerable and timely release of gas can be measured. This considerable release due to the high velocities reached by the falling water and the bubbles generated downstream of the jump was evaluated in the mountain stream Streangbach during several days of data collection. Continuous dissolved CO2 detection probes inserted immediately upstream to downstream of the stream jumps were used for collection, in addition to a third probe inserted in the pool. The purpose of this analysis is to evaluate and verify the extent of this dispersion phenomenon along with carbon dioxide production by observing the difference between the values obtained at the jumps and their theoretical formulation in the absence of production.
Nei fiumi e nei torrenti è continuamente prodotta CO2 dal metabolismo dei microrganismi che vivono sui loro alvei. Studi dimostrano che, la CO2 disciolta nei corsi d’acqua, venga gradualmente e naturalmente rilasciata in atmosfera nei casi in cui l’alveo sia regolare, in corrispondenza di salti anche di pochi centimetri invece è possibile misurare un considerevole e puntuale rilascio di gas. Questo ingente rilascio dovuto alle alte velocità raggiunte dall’acqua in caduta e alle bolle generate a valle del salto è stato valutato nel torrente montano Streangbach durante diversi giorni di raccolta dati. Per la raccolta si sono utilizzate delle sonde per la rilevazione continua della CO2 disciolta inserite subito a monte a valle dei salti dei corsi d’acqua, oltre ad una terza sonda inserita nella pozza. Scopo di questa analisi è valutare e verificare l’entità di questo fenomeno di dispersione insieme alla produzione di anidride carbonica osservando la differenza tra i valori ottenuti in corrispondenza dei salti e la loro formulazione teorica in assenza di produzione.
Variabilità spaziale della concentrazione di CO2 attraverso i salti di fondo di un torrente montano
BUNC, ERIC
2023/2024
Abstract
In rivers and streams, CO2 is continuously produced by the metabolism of microorganisms living on their riverbeds. Studies show that, CO2 dissolved in streams, is gradually and naturally released into the atmosphere in cases where the riverbed is regular, at dips of even a few centimeters instead a considerable and timely release of gas can be measured. This considerable release due to the high velocities reached by the falling water and the bubbles generated downstream of the jump was evaluated in the mountain stream Streangbach during several days of data collection. Continuous dissolved CO2 detection probes inserted immediately upstream to downstream of the stream jumps were used for collection, in addition to a third probe inserted in the pool. The purpose of this analysis is to evaluate and verify the extent of this dispersion phenomenon along with carbon dioxide production by observing the difference between the values obtained at the jumps and their theoretical formulation in the absence of production.File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.12608/71484