『Abstract
　Steepland rivers draining small, coastal watersheds often have very high suspended sediment loads, but the event characteristics of suspended sediment concentration and yield in this class of river is not well documented. Continuous monitoring at four sites in the Waipaoa River basin, New Zealand, demonstrates that during individual and composite events, suspended sediment concentration versus water discharge relations typically show clockwise hysteresis and that event maximum concentration is poorly related to event peak discharge. The signature of different erosion processes is also imprinted on the event yield magnitude frequency distributions. Gully-dominated tributary basins produce relatively high yields at all frequencies, reflecting greater sediment availability, whereas in tributary basins, where shallow landsliding is the dominant erosion process, there is a steep increase in yields in relation to return period. We estimate that flood discharges from the Waipaoa River approach or exceed the critical suspended sediment concentration (〜40,000 mg L^-1) for hyperpycnal plume generation (because of negative buoyancy) at the river mouth once every 〜40 yr, but in the neighboring Waiapu and Uawa Rivers, the threshold concentration may be exceed once a year and two to three times a year, respectively.』

Introduction
Study area
　Suspended sediment and flow data
　Sediment, river, and coastal water properties
Data processing and analysis
SSC versus water discharge relationships
Event yield magnitude-frequency relationships
Implications for hyperpycnal plume generation
　Reliability of estimates
Conclusions
Acknowledgments
References cited