Análise qualitativa e quantitativa da histerese entre vazão e concentração de sedimentos durante eventos hidrológicos

Translated title of the contribution: Qualitative and quantitative analysis of hysteresis between sediment concentration and flow rate during hydrologic events

J. P G Minella, Gustavo H. Merten, Priscila F. Magnago

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The relationship between flow rate - Q and suspended sediment concentration - SSC demonstrates complex temporal patterns during hydrologic events, which are governed by geomorphology, land use, soil management and rainfall. This fact has important implications for understanding and describing erosive processes and sediment production in catchments. These patterns can be evaluated by their loop hysteresis characteristics on the graph of SSC vs. Q. In this study, the hysteresis effect was analyzed for 19 rainfall events in a rural catchment in Southern Brazil. The events were separated in two groups in relation to soil management (with and without soil management practices). The events were classified according to the type of hysteresis, and a hysteresis index (HI) was calculated to evaluate the magnitude of the difference in phase. Results show that the hysteresis pattern was a clockwise loop, indicating that the peak SSC occurred before the peak Q, which represents rapid mobilization and transfer of sediment in the catchment. The HI was not statistically different between the two periods studied, although there is evidence that the conservation practices do have some influence on the index.

Translated title of the contributionQualitative and quantitative analysis of hysteresis between sediment concentration and flow rate during hydrologic events
Original languagePortuguese
Pages (from-to)1306-1313
Number of pages8
JournalRevista Brasileira de Engenharia Agricola e Ambiental
Volume15
Issue number12
DOIs
StatePublished - Dec 2011

Keywords

  • Catchment
  • Environmental monitoring
  • Hydrosedimentology

Fingerprint Dive into the research topics of 'Qualitative and quantitative analysis of hysteresis between sediment concentration and flow rate during hydrologic events'. Together they form a unique fingerprint.

Cite this