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

    9 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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