The relationship between climate and streamflow in the Namoi Basin |
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| Institution: | 1. Aarhus University, Department of Environmental Science;2. Aarhus University, Department of Bioscience;1. College of Environment, Hohai University, Nanjing 210098, China;2. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China;1. Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti, 06125 Perugia, Italy;2. Department of Pharmaceutical Sciences, University of Perugia, Via del Liceo, 06123 Perugia, Italy;3. ACS Dobfar Spa, Viale Addetta 4/12, 20067 Tribiano (MI), Italy;1. Fire Safety, Sweco (Denmark), Copenhagen, Denmark;2. Technical University of Denmark, Department of Civil Engineering (DTU-Byg), Lyngby, Denmark;1. Department of Earth and Environmental Sciences, Macquarie University, Sydney, Australia;2. Science Economics and Insights, NSW Department of Planning, Industry and Environment, Sydney, Australia;3. School of Biosciences, University of Melbourne, Parkville, Victoria, Australia;4. Caribbean Institute for Meteorology and Hydrology, Husbands, St. James, Barbados |
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| Abstract: | The Namoi River Basin (42 000 km2) is located in the Murray-Darling Basin, west of the Great Australian Dividing Range in northeast New South Wales (NSW), and includes some of the most fertile agricultural lands in Australia. One of the environmental concerns for this basin is erosion and its effects on downstream water quality. Models that relate climate, land use, and these concerns require measurements of climate (rainfall and temperature) and streamflow. These measurements were examined as a preliminary to the modelling. The residual mass technique was used to examine the temporal variation of annual rainfalls over the approximately 100 years of available data, and significant spatial variations were found in annual rainfall trends over the catchment. Streamflow was examined at key river gauging stations. The impact of recent large-scale irrigation operations was clearly observed. The impact of changing land use and land management on runoff ratios was examined for eight subcatchments. Temperature variations were examined for the four major towns in the catchment. The duration of the temperature data is too short to make any comments about long-term trends. Significant variations were observed in an east to west direction. |
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