Scour and Erosion IX contains the peer-reviewed scientific contributions presented at 9th International Conference on Scour and Erosion (ICSE 2018, Taipei, Taiwan, 5–8 November 2018), and includes recent accomplishments about scour and erosion in field observation, experimental laboratory work, theoretical development, numerical modeling and disaster management.The book covers fourteen topics:Internal erosionRiver, coastal, estuarine and marine scour and erosionRock scour and erosionSediment transport: grain scale and continuum scaleScour and erosion around structuresSoil erosion, restoration mechanisms and conservationHillslope conservation and debris flowGeotechnical issues related to scour and erosionField observation and analysesScour and erosion testing and experimentRemote sensing, instrumentation and monitoringAdvanced numerical modelling of scour and erosionNatural hazards due to scour and erosionManagement of scour/erosion and sediment.