Influences of topographic index distribution on hydrologically sensitive areas in agricultural watershed

Lianqing Xue, Ruiling Bao, Thomas Meixner, Guang Yang, Jingnan Zhang

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

A hydrologically sensitive area (HSA) is an area with a very quick response to runoff and higher surface runoff probability since all watersheds are prone to generate runoff in one way or the other. The accurate description of runoff generation in time and space has important practical significance for land use and watershed management. The aim of this article was to establish HSAs identification method based on topographic index, and to estimate the spatio-temporal variability of surface runoff probability in different periods. The sensitive month was defined using critical monthly surface runoff probability combined with topographic index. Then the corresponding spatial and temporal boundary of HSA was estimated by the relation of average annual runoff and topographic index. The presented approach was applied in Meishan watershed, which is humid in the summer and has a monsoon climate. The analysis results indicated the probably sensitive months are from February to October with spatial topographic index distribution ranging from 13.02 to 17.13. April–October was estimated as seasonal HSAs with topographic index ranging from 9.21 to 14.05. In addition, the inter-annual variability of seasonal HSAs is much greater and the critical topographic index is 9.21 in July.

Original languageEnglish (US)
Pages (from-to)2235-2242
Number of pages8
JournalStochastic Environmental Research and Risk Assessment
Volume28
Issue number8
DOIs
StatePublished - Oct 31 2014

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Keywords

  • Hydrologically sensitive areas
  • Identification
  • Topographic index
  • Watershed

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Safety, Risk, Reliability and Quality
  • Water Science and Technology
  • Environmental Science(all)

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