Evaluation of safety of hydraulic structures affected by migrating pits

Yeou-Koung Tung*, Keh-Chia Yeh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Because it can be carried by flowing water, a sand/gravel pit on the river bed could migrate downstream. Consequently, the presence of pits on river beds could pose a safety threat to in-stream hydraulic structures such as bridge piers. A pit migration model can be used to predict progressive changes of pit geometry as it migrates downstream. However, due to the existence of many uncertainties, the maximum pit depth cannot be predicted with certainty. This paper adopted a simple pit migration model and evaluated the uncertainty associated with the calculated maximum pit depth. Such information is essential for evaluating the probability that a migrating pit could pose a safety threat to a downstream hydraulic structure. Three reliability analysis techniques were applied and their performances were compared.

Original languageEnglish
Pages (from-to)131-145
Number of pages15
JournalStochastic Hydrology and Hydraulics
Issue number2
StatePublished - 1 Jun 1993


  • Safety
  • reliability analysis
  • uncertainty analysis

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