Abstract
Regional flood modelling is widely used in hydrologic practice for estimation of design floods in ungauged catchments and also to compare design flood estimates obtained by other methods (such as rainfall-runoff modelling) in both the gauged and ungauged catchments. In Australia, a new regional flood frequency estimation (RFFE) model, known as 'RFFE Model 2015' has been developed recently and included in Australian Rainfall and Runoff (ARR), the national guide for flow estimation. This paper compares ordinary kriging and RFFE Model in estimating design floods for Tasmania State in Australia. The RFFE Model is based on a regional LP3 distribution and region-of-influence approach, while the kriging uses spatial interpolation technique to estimate flood quantiles. Based on a leave-one-out validation, it has been found that relative error is significantly reduced (22% to 37%) by kriging. The results found in this study may lead to the recommendation of kriging model for design flood estimates in ungauged catchments in Tasmania. Further investigation is required to make a firm conclusion about the applicability of the kriging in RFFE in Tasmania and other Australian states.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 37th Hydrology & Water Resources Symposium 2016: Water, Infrastructure and the Environment, 28 November - 2 December 2016, Queenstown, New Zealand |
| Publisher | Engineers Australia |
| Pages | 431-438 |
| Number of pages | 8 |
| ISBN (Print) | 9781922107954 |
| Publication status | Published - 2016 |
| Event | Hydrology and Water Resources Symposium - Duration: 28 Nov 2016 → … |
Conference
| Conference | Hydrology and Water Resources Symposium |
|---|---|
| Period | 28/11/16 → … |
Keywords
- flood forecasting
- runoff
- floods
- mathematical models
- Tasmania
