Scour at Bridge Piers Protected by the Riprap Sloping Structure: A Review

Bridge piers on large rivers are often protected from scouring using launchable stone, such as a riprap sloping structure. While such scour countermeasures are effective for pier protection, they significantly alter flow conditions in the bridge opening by overtopping flow and flow contraction, deflecting the formation of the scour hole downstream and exposing the downstream riverbed to additional scour. This paper provides a comprehensive and relevant review of bridge scour estimation methods for piers with a riprap sloping structure installed as a scour countermeasure. Research on empirical methods for bridge scour estimation is reviewed and analyzed with formulae used for comparable structures—complex pier formulae and formulae for river training structures. A summary of relevant formulae applicable to piers with installed scour countermeasures is provided, as well as a discussion on the possible future research directions that could contribute to the field.

Countermeasure Research on the Development of Trade in Tourism Service in Hainan under the Background of One belt One Road

With the proposal of the Belt and Road Initiative, Hainan has witnessed a great development opportunity. This article analyzes the importance of Hainan in the Belt and Road Initiative from the perspectives of history, location and culture. Based on the prop position of tourism industry in Hainan’s economy, it puts forward that trade in tourism service should be considered as an important joint point for the construction of “One Belt, One Road”. Countermeasures and suggestions for the development of trade in tourism service in Hainan are put forward combined with the strategic background of “One Belt, One Road”.