地下水 賦存 調査 硏究 : 靈光地域 韓國水文地質圖 8卷
|서명||地下水 賦存 調査 硏究 : 靈光地域 韓國水文地質圖 8卷|
|초록||This study is objected to characterize groundwater resources, to assess groundwater contamination, and to produce hydrogeological and related thematic maps of the study area. The study area, Younggwang County, Chonnam Province, covers the area of 460 ㎢. To accomplish the objectives various studies have been carried out including general and structural geology, GIS, hydrogeology, geophysics and hydrogeochemical analysis. Geophysical explorations, dipole-dipole resistivity, Schulumberger sounding and magnetic method, were executed for investigating geologic structure and determining test borehole sites. Some test boreholes such as, Honggok, Donggan, Weolsan and Seolmae hitted aquifer structures. Geophysical leggings, such as gamma ray, temperature, water conductivity, electrical resistivity, self-potential were also executed for petrological differentiation and in out flow of groundwater. The recharge rate of granitic region is more than the others, which derived by the analysis of 7 low-flow measurements in 10 small watersheds in the area. The recharge rate has been estimated at 7.2% (99.3 mm/year) in the vicinity. Well inventory of the area included 197 deep wells and 43 shallow wells. In addition, 10 stream samples and one spring were surveyed for water level, water temperature, pH, EC, TDS and the concentration of dissolved oxygen(DO). The results of well inventory are as follows: **table**. Regional groundwater pollution susceptibility was analyzed using GIS technique. A standard method, "DRASTIC" developed by US EPA, was applied to evaluate groundwater pollution potential and aquifer susceptibility Resulting DRASTIC indices ranged from 52 to 141, and the Pesticide indices from 61 to 187. Seawater intrusion phenomena in Sangsari-Hasari, western coastal area from Younggwang-eup, are considered and evaluated by well inventory and the selected borehole's electric conductivity (EC) logging. EC leggings for 9 boreholes are conducted 3 times at March, June and September, and their results show that seawater intrusion to the vulnerable coastal alluvium aquifers is generally depleted with time. Daily fluctuation of seawater mixing contents are also observed through continuous EC logging of the selected boreholes. A total of 20 boreholes were drilled to the total length of 2,028m for hydraulic tests (pumping and packer peremeability tests) and water-quality analysis. Transmissivity measured at the well No. YGK-3 in granite bedrock area in Taema-Myeon is 1.3l㎡/day, the minimum of all the measured ones. The well No. YGK-8, located in the andesite bedrock area, shows the maximum value of the transmissivity of 17.43㎡/day. This result indicate that, in the study area, groundwater movement is better in the areas of andesite bedrocks than in those of granite and schist bedrocks. Specific capacities measured from a total of 191 deep wells range from 0.57㎡/day to 83.33㎡/day, with an average of 17.85㎡/day. Northwestern parts of the study area show relatively high values of specific capacity. Relationships among groundwter productivity, bedrock geology and main aquifers are as follows : **table**. The amount of potential groundwater resources in the study area is estimated approximately 90x10/sup 6/㎥. And, groundwater safe-yield is also approximated to be 120,000㎥/day without any disturbance of water balance|
|페이지||xv, 234 p.|
|키워드||지하수, 부존, 영광, 한국수문지질도, 수문지질도, 오염, 지화학도, GIS, 해수침투, 우물|
최순학. (1997). 地下水 賦存 調査 硏究 : 靈光地域 韓國水文地質圖 8卷. 韓國資源硏究所.