流域地貌系统的侵蚀演化与耗散结构

通过耗散结构的方法和概念,建立了流域地貌系统中熵产生和超熵产生的表达式。以此分析了流域系统的动力学机制,以黄土高原丘陵沟壑区为例,建立了流域地貌系统的侵蚀演化模型。定量描述了黄土高原丘陵沟壑区流域系统的侵蚀旋回,确定了流域的发育阶段。分析了流域系统侵蚀状况的空间不均匀性。

Evolution and Pissipative Structure in the Drainage-geomorphic system

In this paper .the concepts of entropy ,flux and force in the drainage-geomorphic system have been introduced,and an equation for the entropy production and super-entropy production has al-so been conducted,According to this concept,dynamic mechanism in the drainge-geomorphic sys-tem is analysed,and an evolutional model for the development the drainage-geomorphic system in a hill-gully area on the loess plateau is developed. The model is suitable for the entire process of drainage-geomorphic system. By using this model the erosional cycle in the hill-gully area can be divided into three stages. By quantitatively analysing the Erosional Cycle Theory of Davis and dif-ferent soil erosions at the different stages,non -uniform erosional properties of a drainage-geo-morphic system in space is also founded. In addition,by using that model,an accelerating soil erosional process by human activies and the natural erosion in the hill-gully area is concluded. The model is applied to general drainage-geomorphic systems. An evolutional model of the drainge-geomorphic system with a multicyclic dissipative structure has been expressed. By using the model,the development of the systems has been indicated for different types of drainage-geo-morphic systems. The geomorphic growth mode] is established for the drainge-geomorphic sys-tems, and is verified and tested by experimental data in FGEC.