통리해수욕장(桶里海水浴場) 녹지대조성(綠地帶造成)에 관(關)한 연구(研究)(I) - 사구지주변(砂丘地周邊)의 재해요인분석(災害要因分析) -

Studies on a Plan for Afforestation at Tong-ri Beach Resort - Analysis of Factors Causing Disasters around Beach -

해수욕장(海水浴場) 녹지대(綠地帶)는 휴식시설기능(休息施設機能)과 방재기능(防災機能)을 만족(滿足)할 수 있도록 조성(造成)하여야 되므로 통리해수욕장(桶里海水浴場)에 녹지대(綠地帶)를 조성(造成)하기 위(爲)하여 방재기능측면(防災機能側面)에서 각종재해요인(各種災害要因)을 분석(分析)한 바 다음과 같다. (1) 하계(夏季)의 주풍방향(主風方向)은 SE방위(方位)이다. (2) 하계(夏季)의 1시간평균풍속(時間平均風速)은 2.1~3.0m/sec가, 순간풍속(瞬間風速)은 1.1~2.0m/sec가 발생빈도(發生頻度)가 제일 높다. (3) 구사(丘砂)의 입경(粒徑)은 세립(細粒)이며 광물조성(鑛物組成)은 양적(量的)으로 Quartz, Calcite, Feldspars, Sericite 순(順)이다. (4) 구사(丘砂)의 사별입경급(篩別粒徑級)이 작을수록 Quartz의 수량(數量)은 대단(大端)히 많아지고 Calcite와 Feldspars의 양(量)은 감소(減少)되며 Sericite의 양(量)은 증가(增加)한다. (5) 구사(丘砂)의 직경급(直徑級)에 따른 한계마찰풍속식(限界摩擦風速式) $y=4.191x^{0.221}$이다. (6) 비래염분량(飛來鹽分量)은 정선(汀線)가까이에서 제일 많고 내지(內地)로 향(向)하면서 급격(急激)히 감소(減少)한다. 포착염분량(捕捉鹽分量)의 회귀식(回歸式)은 $y=28.181{\times}(-0.369^x)$이다. (7) 해수함염량(海水含鹽量)은 33‰이다.

This study is carried out for analyzing the factors causing several disasters occurring around beach area in order to set a plan for an afforestation which will fulfill its function as facilities for prevention of disasters and for relaxation around beach resort at Tong-ri, Pokil-my$\bar{o}$n, Wando-gun. The results are as follows : 1. The main wind direction was summer was SE. 2. The first class in the rate of frequency of the hourly average wind speed and the instantaneous wind speed in summer were 2.1-3.0m/sec (29.2%) and 1.1-2.0m/sec (30.6%) respectively. 3. The particle sizes of the dune sands was a little small (82.5% in 0.125 to 0.25mm, $D_{50}=0.178mm$). 4. The mineral composition and the chemical components were as follows : The main mineral : Quartz The accessary minerals : Calcite, Feldspars(Orthoclase), Sericite. The chemical components : $SiO_2$ ; 75.6%. $Al_2O_3$ ; 8.1%, CaO ; 7.76%, Ign. loss ; 6.8%, MgO ; 0.23%, $K_2O$ ; 0.72%, $Na_2O$ ; 0.41%, $Fe_2O_3$ ; 0.32%. 5. The threshold friction velocity equation for the diameter class of the dune sands was $y=4.191x^{0.221}$. 6. The amount of floating salt was maximum at the point of 65m away from beach line, dropped abruptly at 135m and remained almost same on its way to the inland. The equation of the amount of floating salt was $y=28.181{\times}(-0.369^x)$. 7. The amount of extracted salt(33%) in seawater in summer was the same as the one of the nearest seawater of Korea.