1984년 7월 24일에서 동년 8월 2일까지 동해안과 울릉도를 항해중 정선하여 14개의 관측점에서 수심 5m~200m층을 관측한 해중소음의 음압레벨을 분석한 결과, 해중소음은 연안에서 멀리 떨어진 해역의 표층부근에서는 평균 1dB/16m의 비율로 수심이 깊어짐에 따라 낮아지는 경향을 나타내었으며, 정상적인 소음분포 형태를 이루고 있음을 알 수 있었다. 또한, 항구나 항만입구 부근에서는 육상소음의 영향을 받아, 단속적이고 지역적인 소음분포 형태를 이루고 있음과 해저지형과 해상에 따라서도 크게 변동됨을 알 수 있었다.
Vertical distribution of interstitial Cu^(++) contents of bottom sediments, upward benthic flux and oxidation zone flux are measured from the sediments at a site of Gongjichon area, Lake Uiam. Interstitial Cu^(++) contents show a pronounced maximum at water-sediment interface, and linear decrease to the depth of 9 cm at which anoxic sediments begin to occur, which cause an upward benthic flux and oxidation zone flux of interstitial Cu^(++). The depths of minimum interstitial Cu^(++) content show those of maximum sediment Cu^(++) content from which we presume the vertical flux and inter-species exchange of elements in the sediment layer. In oxic zone, interstitial Cu^(++) contents correlate very well with total organic matters, and total organic matters with mean particle size. These facts suggest that the amount of interstitial Cu^(++) contents are mainly controlled by the amounts of organic matters supplied to the sediment when they were deposited rather than by the post-depositional processes in the sediment layers. Upward benthic flux to the overlying water and oxidation zone flux to the interface of oxic and anoxic zone are 5.2×10^(-9)μ㏖·㎝^(-2)·sec^(-1), 0.1×10^(-9)μ㏖·㎝^(-2)·sec^(-1), respectively.
완전 변태류 곤충에 있어서 각유충기의 구분은 두폭에 의하는 것이 상례이다. 그러나 분포의 특성이 정의되지 않는 재래적 방법으로는 객관성이 보장되지 못하며 때로 령기의 판정조차 어려울 경우가 있다 이러한 단점을 보완, 각 령기의 두폭분포의 특성을 통계적으로 기술하기 위해서 "d/w"비의 개념을 도입하는 것을 검토하였다. 쌀바구미 유충의 두폭분포를 이 비를 이용하여 정의하였으며 이러한 예는 다른 곤충의 경우에 있어서도 합리적으로 적용될 수 있음을 보여주는 것이라 사료된다.
This study focused to reveal mineralogical and petrochemical properties and the stratigraphy of the volcanic rocks along the downstream of the Hantan River in Choongaryong Rift Valley. The geological sequences of this area are as follows: The basement of this area consists of Precambrian metasedimentary rocks of the Yeoncheon System. The Biotite Granodiorite of Jurassic age intruded into the Yeoncheon System in the eastern side of the area. Several small exposures of the basalt of post-Jurassic age, which was maned as $quot;Tongjae Basalt$quot;occur dispersely along the west slope of the valley. A conglomerate formation overlay the eroded surface of Tongjae Basalt and contains rounded and angular pebbles and is unconformable overlain by Lapilli Lithic Tuff. A basalt outcrop exposed as small an exposure near Jangtanri creek and intruded the Lithic Tuff, maned as : Jangtanri Basalt.$quot; Granite porphyry dikes intruded into the Lithic Tuff in Tongjae area. An Alkali Loivine Basalt of the Cenozoic Era with 3∼11 different eruptions flowed on the surfaces of the abouve mentioned Precambian metasedimentary rocks, Biotite Granodiorite, Lithic Tuff and Unconsolidated in the valley and formed marrow plateaus. The Alkali Basalt consists mainly of olivine, diopside, hypersthene and labradorite, and is called in this study as $quot;Jeongog Basalt$quot;. the age of the last flow is estimated as late Pleistocene or early Holocene.