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首页> 外文期刊>Progress in Physical Geography >Digital elevation model-based watershed geomorphic entropy for the study of landscape evolution of a watershed geomorphic system in the loess landforms of China
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Digital elevation model-based watershed geomorphic entropy for the study of landscape evolution of a watershed geomorphic system in the loess landforms of China

机译：基于数字海拔模型的流域地貌熵研究了中国水土地貌流域地貌体系景观演变研究

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摘要

Although the concept of entropy in landscape evolution was proposed over 40 years ago, previous studies of geomorphic entropy paid little attention to the applications of geomorphic entropy in the erosional watershed geomorphic system on the Loess Plateau in China. Therefore, we propose a new concept of entropy called watershed geomorphic entropy (WGE) and its method of calculation based on a digital elevation model and the principles of system theory. To study the geomorphic significances of WGE, we applied the WGE to an artificial rainfall experiment that was originally designed to study erosional processes in a small open watershed geomorphic system on the Loess Plateau. Our study shows that the decrease of WGE in an open watershed geomorphic system means a gradual erosional or erosion-dominated landscape evolutional process and the change of WGE shows a perfectly positive linear correlation with the measured sediment yields of the outlet of the watershed system under our experimental conditions. In addition, to some extent, the decrease of the change of WGE also reflects the reduction of total potential energy of a specific erosional, or erosion-dominated, open watershed geomorphic system.
机译：虽然40年前提出了景观演变的熵概念，但前面的几何熵研究几乎没有注意地貌熵在中国黄土高原腐蚀流域地貌系统中的应用。因此，我们提出了一种新的熵概念，称为流域地貌熵（WGE）及其基于数字高程模型的计算方法及系统理论原理。为研究WGE的几何意义，我们将WGE应用于人工降雨实验，最初旨在研究黄土高原上小型流域地貌系统中的侵蚀过程。我们的研究表明，开放的流域地貌系统中的WGE降低是指逐渐侵蚀或侵蚀主导的景观进化过程，WGE的变化显示了与我们的流域系统出口的测量沉积物产生的完全正线相关性。实验条件。此外，在某种程度上，WGE的变化的减少也反映了特定侵蚀或侵蚀占据的公开流域地貌系统的总潜在能量的减少。

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