Journal of Groundwater Hydrology
Online ISSN : 2185-5943
Print ISSN : 0913-4182
ISSN-L : 0913-4182
Search
Advanced search
OR
Browse
Search
Volume 46, Issue 4
Displaying 1-3 of 3 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Analysis of groundwater flow in a fractured rock mass in Pahala Mattala area, Sri Lanka using Don-Chan, a three-dimensional channel network model
    Kumuduni M. K. D. GAMAGE, Hiroyoshi YAMADA, Kunio WATANABE, Yuichi HAT ...
    2004 Volume 46 Issue 4 Pages 277-297
    Published: November 20, 2004
    Released on J-STAGE: December 11, 2012
    DOIhttps://doi.org/10.5917/jagh1987.46.277
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The behavior of groundwater flow in a fra ctured rock mass in Pahala Mattala area, southern Sri Lanka was studied. Hydrogeological data obtained by Water Resources Board in Sri Lanka (WRB)and Japan International Cooperation Agency (JICA) was used in this study. Idealized models of fractured rock mass were constructed on the basis of the fracture data. Don-Chan (Donen-Saitama Channeling Flow Model), channel network model, was adopted for the analysis of groundwater flow and it was assumed that the fractures are divided into three types: major fractures, minor fractures and fault zones. Pumping test results obtained by two wells were analyzed with the' aim to calibrate channel transmissivity values of different fracture types. Model verification was done using pumping test results obtained by another combination of wells. It was found that, the channel network model in the Pahala Mattala area had the capability to predict accurately the groundwater flow for new pumping operations that will be planned in future to develop groundwater resources in deep underground.
    View full abstract
    Download PDF (5877K)
  • Effects of tidal river on the temporal variation of saltwater intrusion in a coastal aq uifer
    Jun YASUMOTO, Yohsuke SHIBA, Taku FUJIWARA, Kunio OHTOSHI
    2004 Volume 46 Issue 4 Pages 299-313
    Published: November 20, 2004
    Released on J-STAGE: December 11, 2012
    DOIhttps://doi.org/10.5917/jagh1987.46.299
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Dynamics of saltwater intrusion in a coa s tal aquifer near the tidal river is dependent on the temporal variations of both sea and river water levels. Composite effects of sea and tidal river, however, are difficult to isolate quantitatively on the basis of the field measurements conducted under ordinary conditions. In this study, special conditions were created in which the variation of water level of a tidal river was kept to be fixed by closing the river gates for a certain time. Field measurements were performed to investigate the spatial and temporal variations of saltwater intrusion in an aquifer. The contribution of tidal river to saltwater intrusion was isolated by comparing the acquired data with the data obtained under the ordinary conditions. The observations were verified by numerical simulation based on the sharp interface between fresh and saline groundwater and some suggestions were pointed out on the practical operations of river gates.
    View full abstract
    Download PDF (10141K)
  • Visit to Valuable Water Springs (67)
    Valuable Water Springs in Ibaraki Prefecture
    Makoto YOSHIDA
    2004 Volume 46 Issue 4 Pages 315-323_1
    Published: November 20, 2004
    Released on J-STAGE: December 11, 2012
    DOIhttps://doi.org/10.5917/jagh1987.46.315
    JOURNAL FREE ACCESS
    Download PDF (18535K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top