Currently water demand in our country is rapidly increasing as a result of fast industrial development and population growth. However, due to regional characteristics of the land, water resources are geographically disproportionate in our country, and in this environment as a way to meet water deman...
Currently water demand in our country is rapidly increasing as a result of fast industrial development and population growth. However, due to regional characteristics of the land, water resources are geographically disproportionate in our country, and in this environment as a way to meet water demand ground water development is being massively carried out. Especially in coastal areas that have a high level of dependence on ground water, as work on development of ground water is being recklessly progressing without having a proper evaluation, resulting in water level fluctuation, salt intrusion where sea water permeates into the fresh ground water system is taking place. Seawater intrusion that occurs in most coastal areas as a natural disaster leads to decreased crop yields caused by soil containing salinity, and lack of water for residential, industrial and agricultural purposes caused by ground water containing salinity. Since repairing the damage by such salt intrusion requires an enormous amount of cost and time, it is essential to correctly grasp the current extent of damage in possibly affected areas and aggressively set up disaster prevention measures.
In this study, by utilizing the data that examined the chloride ion concentration of ground water wells in the west coast of Jeollabukdo the impact of salt intrusion applying the GIS spatial estimation method was analyzed. In particular, through the designation of a validation point among ground water wells and then the analysis of error characteristics of the chloride ion concentration by each method of IDW (Inverse Distance Weight), Spline, and Kriging Interpolation a spatial estimation method which is proper for estimating salt intrusion was selected. The affected areas by salt intrusion were examined by analyzing the results of chloride ion concentration according to administrative districts or sections of water quality standard. The main conclusion from this study is as follows.
First, as a result of analyzing the error characteristics of various spatial estimation methods by using the data from the chloride ion concentration of 485 ground water wells, the IDW method was found to be the most appropriate for estimating chloride ion concentration by salt intrusion.
Second, analyzing the average chloride ion concentration of the targeted regions has revealed that Gunsan-si with the record of 541㎎/ℓ did not meet water quality standards even for industrial use. Both Gimje-si and Gochang-gun satisfied drinking water quality standards and Buan-gun with 272㎎/ℓ was slightly below the standards for drinking water. Also, as to sections of water quality standard which is less than 250㎎/ℓ, 250~500㎎/ℓ, and 500㎎/ℓ, the percentage of Gunsan-si is 44.4%, 14.4%, and 41.2% respectively, which showed that the city was greatly affected by salt intrusion compared to other areas.
Third, concerning the results of analysis according to administrative districts, as the areas adjacent to the west coast such as Daemyeong-dong, Joong-dong, Jangjae-dong and Guemam-dong in Gunsan-si are found to have very high chloride ion concentration, and both Hoehyeon-myeon and Daeya-myeon bounded by the Mankeong river did not meet water quality standards even for industrial use. From these facts, it is concluded that salt intrusion has a great effect on Gunsan-si generally.
Fourth, the results of analysis of Jinbong-myeon and Gwanghwal-myeon of Gimje-si, and Gyehwa-myeon and Byeonsan-myeon of Buan-gun adjacent to the west coast have revealed that those areas fell short of water quality standards for industrial use. Also, the chloride ion concentration of Simwon-myeon of Gochang-gun adjoining the west coast was below water quality standards for industrial use, and Sangha-myeon is little affected by salt intrusion even though the area is adjacent to the west coast.
Currently water demand in our country is rapidly increasing as a result of fast industrial development and population growth. However, due to regional characteristics of the land, water resources are geographically disproportionate in our country, and in this environment as a way to meet water demand ground water development is being massively carried out. Especially in coastal areas that have a high level of dependence on ground water, as work on development of ground water is being recklessly progressing without having a proper evaluation, resulting in water level fluctuation, salt intrusion where sea water permeates into the fresh ground water system is taking place. Seawater intrusion that occurs in most coastal areas as a natural disaster leads to decreased crop yields caused by soil containing salinity, and lack of water for residential, industrial and agricultural purposes caused by ground water containing salinity. Since repairing the damage by such salt intrusion requires an enormous amount of cost and time, it is essential to correctly grasp the current extent of damage in possibly affected areas and aggressively set up disaster prevention measures.
In this study, by utilizing the data that examined the chloride ion concentration of ground water wells in the west coast of Jeollabukdo the impact of salt intrusion applying the GIS spatial estimation method was analyzed. In particular, through the designation of a validation point among ground water wells and then the analysis of error characteristics of the chloride ion concentration by each method of IDW (Inverse Distance Weight), Spline, and Kriging Interpolation a spatial estimation method which is proper for estimating salt intrusion was selected. The affected areas by salt intrusion were examined by analyzing the results of chloride ion concentration according to administrative districts or sections of water quality standard. The main conclusion from this study is as follows.
First, as a result of analyzing the error characteristics of various spatial estimation methods by using the data from the chloride ion concentration of 485 ground water wells, the IDW method was found to be the most appropriate for estimating chloride ion concentration by salt intrusion.
Second, analyzing the average chloride ion concentration of the targeted regions has revealed that Gunsan-si with the record of 541㎎/ℓ did not meet water quality standards even for industrial use. Both Gimje-si and Gochang-gun satisfied drinking water quality standards and Buan-gun with 272㎎/ℓ was slightly below the standards for drinking water. Also, as to sections of water quality standard which is less than 250㎎/ℓ, 250~500㎎/ℓ, and 500㎎/ℓ, the percentage of Gunsan-si is 44.4%, 14.4%, and 41.2% respectively, which showed that the city was greatly affected by salt intrusion compared to other areas.
Third, concerning the results of analysis according to administrative districts, as the areas adjacent to the west coast such as Daemyeong-dong, Joong-dong, Jangjae-dong and Guemam-dong in Gunsan-si are found to have very high chloride ion concentration, and both Hoehyeon-myeon and Daeya-myeon bounded by the Mankeong river did not meet water quality standards even for industrial use. From these facts, it is concluded that salt intrusion has a great effect on Gunsan-si generally.
Fourth, the results of analysis of Jinbong-myeon and Gwanghwal-myeon of Gimje-si, and Gyehwa-myeon and Byeonsan-myeon of Buan-gun adjacent to the west coast have revealed that those areas fell short of water quality standards for industrial use. Also, the chloride ion concentration of Simwon-myeon of Gochang-gun adjoining the west coast was below water quality standards for industrial use, and Sangha-myeon is little affected by salt intrusion even though the area is adjacent to the west coast.
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