The behaviors and characteristics of rivers are the important issues of flood control and habitat restoration. Little literature, however, is available on the classification and application of river morphology in Taiwan. Therefore, this study proposed the method of River Morphology Five Level Classification, which was established upon spatial scale and force, to define the influential levels of river behaviors. This classification method was divided into five levels, i.e. Level I: Basin,Level II: Drainage, Level III: Main River, Level IV: Channel and Level V: Habitat with spatial scale.Level I and Level II explained the geometric shape and pattern of the basin and drainage. Level III and Level IV focused on the hydraulic behaviors in the main rivers and channels. Level V determined the physical habitat quantitatively. According to the theoretic framework, this study proposed the analyzed method of each morphological parameter, and applied the River Morphology Five Level Classification to the case of Dajia River.
Key Words : River morphology, classification, dajia River.