Type

Journal Article

Authors

Darren Healy
Neill Brauders
Michael Bruen
J. J. O'Sullivan
Sangaralingam Ahilan

Subjects

Environment

Topics
multivariate analysis boundary conditions extreme value regression analysis river engineering floods and floodworks hydrology and water resource frequency analysis

Bankfull discharge and recurrence intervals in Irish rivers (2012)

Abstract Different definitions of the bankfull condition in rivers are based on morphological characteristics, boundary conditions and geometrical properties. Consequently, the magnitude and associated return period of the bankfull discharge can be ambiguous. Knowledge of this discharge is important in index flood estimation and subsequent regional flood frequency analysis. This study investigates bankfull discharges and recurrence intervals at 88 locations in the Irish river network using a combination of surveyed bankfull levels, rating curves and equations and photographic records at the sites in question. Catchments ranged in area from approximately 23 km2 to 2778 km2. Recurrence intervals were determined by fitting generalised extreme value (GEV) distributions to the annual maximum flow series at the sites investigated. These intervals were found to be less than 2 years (the median annual flood) at 42 stations (48%) and less than 2·33 years (the mean annual flood assuming a GEV type 1 distribution) at 47 stations (53%). Higher return periods of between 2·33 and 10 years and 10 and 25 years were observed at a further 20% and 6% of locations respectively. Using multivariate regression analysis, the computed bankfull discharges are correlated with catchment descriptors and three expressions are presented for estimating bankfull flows.
Collections Ireland -> University College Dublin -> Civil Engineering Research Collection
Ireland -> University College Dublin -> College of Engineering & Architecture
Ireland -> University College Dublin -> School of Civil Engineering

Full list of authors on original publication

Darren Healy, Neill Brauders, Michael Bruen, J. J. O'Sullivan, Sangaralingam Ahilan

Experts in our system

1
Michael Bruen
University College Dublin
Total Publications: 64
 
2
John O'Sullivan
University College Dublin
Total Publications: 46