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Assessing the Joint Probability of Fluvial and Tidal Floods in the River Roding
Author(s) -
ACREMAN M. C.
Publication year - 1994
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.1994.tb01140.x
Subject(s) - fluvial , tidal river , hydrology (agriculture) , flood myth , environmental science , joint probability distribution , streamflow , water level , joint (building) , flow (mathematics) , geology , drainage basin , oceanography , geomorphology , statistics , geotechnical engineering , geography , mathematics , estuary , architectural engineering , archaeology , cartography , structural basin , engineering , geometry
Water levels in the lower reaches of most rivers are controlled by the interaction of fluvial flows and tides. Assessment of the risk of over‐bank inundation therefore requires an estimation of the probability of experiencing combinations of river floods and high tides and calculation of the water levels resulting from their interaction. This may be achieved by numerical integration of the marginal probability distributions of river floods and sea‐levels, but this is complex mathematically and requires explicit knowledge of the correlation structure. In this paper a solution is developed for risk assessment in the lower River Roding, by reconstructing the historical water levels from river flow and tidal records using a hydraulic model. The resulting water‐level series is then analysed statistically to estimate the probability that certain critical levels will be exceeded. The model allows for operation of the River Roding's flood‐protection barrier and for the effects of a general rise in sea level.