Construction Method and Application of Space Velocity Field Based on DEM

XIE Zhi-gang,SHI Peng,JI Xiao-min,ZHAO Lan-lan,QU Si-min,CUI Yan-ping

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China Rural Water and Hydropower ›› 2019 ›› (6) : 6-9.

Construction Method and Application of Space Velocity Field Based on DEM

  • XIE Zhi-gang1,SHI Peng1,2,JI Xiao-min3 ,ZHAO Lan-lan4,QU Si-min1,CUI Yan-ping3
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Abstract

The calculation of flow velocity at each point in the basin has an important influence on the basin confluence. A calculation method of Manning formula considering rainfall intensity is proposed to construct the spatial velocity field so as to make the calculation of confluence more accurate. The calculation method considering the topography, hydraulic conditions and the influence of rainfall intensity on velocity, the comparative calculation method of Yu Manning formula, the calculation condition is more practical. Based on the spatial velocity field constructed by velocity calculation, the time probability density distribution function of watershed confluence, i.e. the geomorphological instantaneous unit line, is deduced and applied to the Dingan River Basin in Wanquan River System.The results show that the flood process line calculated by the Manning formula considering the rainfall intensity is better than that calculated by the Manning formula.

Key words

patial velocity field / geomorphic instantaneous unit hydrograph (GIUH) / rainfall intensity / Manning formula / confluence time.

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XIE Zhi-gang,SHI Peng,JI Xiao-min,ZHAO Lan-lan,QU Si-min,CUI Yan-ping. Construction Method and Application of Space Velocity Field Based on DEM. China Rural Water and Hydropower. 2019, 0(6): 6-9

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