A hydrological tank model assessing historical runoff variation in the Hieu River Basin

Ho Thi Phuong, Nguyen Xuan Tien, Hidetaka Chikamori, Kenji Okubo

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The Hieu River is the largest tributary on the left bank of the Ca River, which is one of the large basins in north-central Vietnam. Here, we use cumulative anomaly tests and Pettitt tests to ascertain the turning points in annual rainfall and discharge during the time period 1962-2014. The results of our statistical analysis reveal a breaking point in 1982 for the rainfall time series and in the late 1970s and late 1990s for the discharge time series. A storage-type hydrological model is used to determine runoff processes for different periods corresponding to detecting points of rainfall and discharge. The results of our model simulation confirm that a two-tank model with monthly input data is the most appropriate tank model for the Hieu River. The difference between the hydrographs improved when we used a rain factor function. A comparison between the observed and calculated runoff revealed a drastic decrease between 1999 and 2014. The rate of discharge loss in the Lower Basin was approximately six times higher than that in the Upper Basin, a finding potentially due to reservoir construction and intensive water use for agricultural and residential purposes.

Original languageEnglish
Pages (from-to)75-86
Number of pages12
JournalAsian Journal of Water, Environment and Pollution
Issue number1
Publication statusPublished - 2018


  • Ca river basin
  • Hydrological tank model
  • monthly data input
  • runoff variation

ASJC Scopus subject areas

  • Water Science and Technology
  • Pollution


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