摘要
凭借"大数据"可以精细刻画降雨空间分布和下垫面空间变异性的优势,提出了"大数据"背景下考虑降雨空间分布和下垫面空间变异性对流域产汇流影响的计算方法,即单元嵌套网格剖分流域的方法。通过引入"网格水滴"的概念揭示了流域瞬时单位线的物理本质,对由RodriguezIturbe和Valdes所提出R-V地貌瞬时单位线理论进行补充,分析了等流时线法和单位线法的局限性,提出的单元嵌套网格产汇理论既克服了等流时线法和单位线法的缺点,也吸取了它们的优点,为在"大数据"支撑下统一等流时线和单位线法提供了可行性。
A method for dividing watershed by grid inlaid in watershed basic unit is discussed. As big data can precisely describe space distribution of rainfall and spatial variability of underlying surface,a calculation method based on big data, considering effects of space distribution of rainfall and spatial variability of underlying surface on runoff yield and confluence,is proposed. Through an introduction of “ grid drop 冶,the physical nature of watershed instantaneous unit hydrograph is revealed,and the theory of geomorphologic instantaneous unit hydrograph by Rodriguez-Iturbe and Valdes is supplemented. In addition, the limitations of the isochronism line method and the unit hydrograph method are investigated. It can be concluded that the proposed theory of runoff yield and confluence by grid inlaid overcomes the disadvantage and assimilates the advantages of the two methods mentioned above, and provides a possibility of unifying the two methods.
出处
《水利水电科技进展》
CSCD
北大核心
2017年第2期1-6,共6页
Advances in Science and Technology of Water Resources
基金
国家自然科学重点基金(41130369
41430855)
关键词
流域基本单元
网格水滴
流域产汇流
大数据
流域地貌瞬时单位线
等流时线
watershed basic unit
grid drop
runoff yield hydrograph of watershed
isochronism lineconfluence
big data
geomorphologic instantaneous unit
