Rainfall-Runoff Modelling in South-west Western Australia. 2. Rainfall-Runoff Modelling Methodology. South-West Western Australia Sustainable Yields Project: Technical Report

[摘要] The South-West Western Australia Sustainable Yields project estimated runoff at 0.05° x 0.05° (~ 5 x 5 km) grid cells in the catchments shown in Figure 2 1 under four scenarios (A, B, C and D defined in Chapter 1 of CSIRO, 2010) and thereby estimate streamflow at defined catchment outflow points referred to as Streamflow Reporting nodes (SRNs). River routing was deemed to be unnecessary in these catchments as they are short enough that flow from the headwaters to the outlet takes only several days, or does not occur because of impoundments. There is no regulated flow on these rivers. The methods used in this project were developments of those used in the Murray Darling Basin Sustainable Yield project (CSIRO 2007) and were similar to those used in the Northern Australia Sustainable Yield and Tasmanian Sustainable Yield projects.Specifically, the rainfall-runoff modelling estimated 33 years of daily catchment runoff generation in the defined catchments for:historical climate (1975 to 2007) and current development (Scenario A) – one single simulation based on the historical climate series;recent climate (1997 to 2007) and current development (Scenario B) – scaled climate series generated as the last 11 years repeated three times (rainfall, temperature and PE);future (~2030) climate and current development (Scenario C) – 45 climate series (rainfall, temperature and PE) based on 15 GCMs for each of the low, medium and high global warming scenarios; and future (~2030) climate and future development (Scenario D) – 45 simulations based on the climate series from Scenario C and modifying the catchment inflows estimated in Scenario C to reflect ~2030 forest plantations and farm dam development for irrigation.The details of the climate scenarios are presented in Chapter 1 and Chapter 2 of the methods report (CSIRO, 2010), with more technical details in a companion report (Charles et al., 2010). All modelling results were presented as projections of future catchment yields, with the first day of the simulations taken as January 1st, 2008, and the climate sequences used as different possible future climates.

[发布日期] 2010-12-01 [发布机构] CSIRO

[效力级别] Earth Sciences not elsewhere classified [学科分类] 地球科学(综合)