Instrumentation and Monitoring of Sand Plugging and Bridge Scour at Selected Streams in Hawaii
-
2013-05-13
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Edition:Final 05/00 – 12/06
-
Corporate Publisher:
-
Abstract:In this project, the authors investigated two practical problems in highway design and maintenance, namely the sand-plugging of highway culverts and flood-induced bridge scour. In coastal states like Hawaii, the highway culverts are frequently clogged by sand carried onshore by ocean tides. The sand plugging of a culvert reduces the drainage capacity of the culvert and may cause serious water backup and flooding of the nearby communities during a storm. The objective of the present study is to achieve a better understanding of sand-plugging and develop potential engineering solutions to mitigate the problem. This was done through field survey, laboratory experiments, and numerical computations. Specifically, the criteria to assess whether an existing culvert can self-clean of the sand blockage during a storm are developed and demonstrated for two specific culverts – the Punaluu and Hauula culverts – in windward Oahu. For flood induced bridge scour, the main objective is to install sensors on selected bridges on Oahu to collect data on scour depth during flood events. These field data can be used to compare with the predicted scour depth based on the HEC-18 scour design manual. The goal is to examine whether the existing prediction equations can provide accurate scour depth calculations for streams and bridges in Hawaii. In this study, the authors installed sensors on two bridges on Oahu. Scour depth data during one flood event were recorded. These data were compared with the predicted scour depth using the HEC-18 equations and the HEC-RAS (Hydrologic Engineering Center River Analysis System) computer software. It was found that the existing HEC-18 equations over-predicted the scour depth by a large margin and need improvement.
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type: