Sensitivity of a basin evolution model to the nature of runoff production and to initial conditions
Sensitivity of a basin evolution model to the nature of runoff production and to initial conditions
复制标题
流域演化模型对径流产生性质和初始条件的敏感性
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
G. Moglen
中科院分区：
文献类型：
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作者：
E. Ijjász;R. Bras;G. Moglen
这项工作研究的影响修改的Willgoose-Bras-Rodiguez-Iturbe盆地演化模型从Hortonian地下饱和的产流机制。修改后的模型还模拟盆地，再现以及共同的地貌统计。这一结果证实了模型适应不同水文环境的能力。原始模型和修正模型之间最重要的区别出现在高程曲线的演变，特别是在饱和和非饱和节点之间的过渡。由于扩散过程（如雨溅和岩石滑坡）的质量运动的作用是更显着的修改后的模型，由于减少了非饱和区的冲刷作用。一个措施是量化的模型对初始条件的敏感性。进化被发现在时间上分离遵循幂律，解释了在初始条件下只有轻微扰动的集水区模拟中存在的明显随机性。这种明显的随机性是模型的弱混沌特征的结果。
This work investigates the effects of modifying the runoff production mechanism used in the Willgoose-Bras-Rodiguez-Iturbe basin evolution model from Hortonian to subsurface saturation. The modified model also simulates basins that reproduce well common geomorphological statistics. This result confirms the ability of the model to adapt to different hydrological environments. The most important difference between the original and the modified model appears in the evolution of the hypsometric curve, particularly in the transition between saturated and unsaturated nodes. The role of mass movement due to diffusive processes (such as rain splash and rock slides) is more significant in the modified model due to decreased role of wash in unsaturated regions. A measure is developed to quantify the sensitivity of the model to initial conditions. Evolutions were found to separate in time following a power law, explaining the apparent randomness present in catchments simulated with only slight perturbations in their initial conditions. This apparent randomness is the result of the weakly chaotic features of the model.