The chemical weathering rate is always far less than the mechanical denudation rate in the same watershed, furthermore, the proportion of total denudation contributed by chemical weathering decreases as total denudation rate increases. 而化学风化率在总剥蚀率中总是处于次要地位,它主要受到流域年均降水量和气温的影响(39%),且不受机械剥蚀率的控制。
The chemical and geochemical features of river water are a manifestation of the extent of surface weathering and denudation. 河流的水化学和地球化学特征可以反映地表风化、剥蚀作用的强弱。河流水体的化学元素组成在很大程度上表征着水体环境质量状况、区域环境化学特征、水体元素分布及迁移转化的规律。
The ablation-resistance mechanisms mainly included transpiration cooling, thermal chemical ablation of coolants and mechanical denudation of ceramics. 复合材料的烧蚀机制为金属相的熔化蒸发相变、热化学烧蚀和陶瓷相的机械冲刷。