A Study of the Roughness of Conceptual River Systems or Watersheds (HES 15)

作者：Terence E. Harbaugh, Ven Te Chow · 发表于：Illinois Digital Environment for Access to Learning and Scholarship (University of Illinois at Urbana-Champaign) · 年份：1967 · 被引用次数：8 · 研究领域：Hydrology and Sediment Transport Processes、Hydrology and Watershed Management Studies、Fish Ecology and Management Studies

Inthis paper, the roughness of a conceptual river system or watershed is investigated by mathematical formulation and laboratory experimentation./ g 3 , By mathematical formulation, the watershed is considered as a quasi-linear p distributed dynamic system.The hydraulic behavior of this system repre- sentation is describkd by a set of quasi-linear partial differential equations of continuity and momentum principles which define the spatially varied un-1 steady flow.The conceptual watershed is composed of the overland flow part and the main channel flow part.The equations axe first applied to the overland flow phase due to input rainfall and then to the main channel flow i !phase using the overland flow as input.Solution of the equations is made in their finite-difference forms on digital computers.The friction slope in the energy equation is expressed by a conceptual measure of the ~a~tershed roughness.This conceptual roughness is further evaluated in a laboratory study of the watershed in various shapes and slopes and its sensitivity to depth of flow and raindrop impact on the laboratory watershed is disclosed.