The impact of land use change on catchment hydrology in large catchments: The Comet River, Central Queensland, Australia
The impact of land use change on catchment hydrology in large catchments: The Comet River, Central Queensland, Australia
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DOI：
10.1016/j.jhydrol.2005.10.030
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发表时间：
2006-07
影响因子：
6.4
通讯作者：
L. Siriwardena;B. Finlayson;T. McMahon
中科院分区：
文献类型：
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作者：
L. Siriwardena;B. Finlayson;T. McMahon
澳大利亚昆士兰州中部的彗星河流域面积为16,440平方公里，在20世纪60年代中期，主要由Brigalow（Acacia harpophylla）主导的天然森林覆盖面积大部分被清除。这提供了一个机会来检查森林转化为草地和农田对大型集水区径流影响的规模依赖性，因为迄今为止报告的大多数研究都是针对非常小的集水区。流量和降雨量的观测数据表明，在后清除期间有一个78%的径流量增加，与前清除期间，这可以解释，在一定程度上，由8.4%的降雨量增加。两种建模策略已被用来检查清除径流的影响。一个年度水平衡模型，使用标准的双曲线函数表明，在后清除期间的径流大于58%，如果清除没有发生。一个简单的概念性的每日径流模型，SIMHYD，校准前清除期间使用各种校准策略，并用于估计径流后清除期间，如果清除没有发生。还应用了反向策略，并报告了模型的总共8次运行。根据该模型，据估计，清除产生了约40%的径流量增加。
The Comet River in Central Queensland, Australia, with a catchment area of 16,440km2was largely cleared of a natural forest cover dominated mainly by Brigalow (Acacia harpophylla) during the mid-1960s. This provides an opportunity to examine the scale dependence of the impact on runoff from a large catchment of the conversion of forest to grass and cropland since most studies so far reported have been for very small catchments. The observed data on flow and rainfall indicate that in the post-clearing period there was a 78% increase in runoff compared with the pre-clearing period which can be explained, in part, by an 8.4% increase in rainfall. Two modelling strategies have been used to examine the impact of clearing on runoff. An annual water balance model using a standard hyperbolic function indicated that runoff in the post-clearing period was greater by 58% than if clearing not occurred. A simple conceptual daily rainfall-runoff model, SIMHYD, was calibrated for the pre-clearing period using various calibration strategies and used to estimate runoff in the post-clearing period as if clearing had not occurred. The reverse strategy was also applied and a total of eight runs of the model are reported. From this modelling it is estimated that clearing has generated an increase in runoff of approximately 40%.