1 Prediction of Beach Changes Around Artificial
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Geochemical Composition of Beach Sands from Tottori Prefecture, Japan
島根大学地球資源環境学研究報告 30, 65~72 ページ(2011 年 12 月) Geoscience Rept. Shimane Univ., 30, p.65~72(2011) Article Geochemical composition of beach sands from Tottori Prefecture, Japan Bah Mamadou Lamine Malick*, Erika Sano* and Hiroaki Ishiga* Abstract Fifteen sand samples were collected from ten beaches along the shoreline of Tottori Prefecture to determine their geochemical compositions, using X-ray fluorescence analysis. Two main river systems (Tenjin and Sendai Rivers) supply sediments to the shoreline from the Chūgoku Mountains. Beach parameters, such as the radius of the approximated circle and radian (ℓ/r), were used to describe beach forms: ℓ/R < 1 describes a short and concave pocket beach. Sands from the eight beaches investigated in the area contained more than 70 wt% SiO2, and are predominantly composed of quartz and feldspar. This was reflected in their geochemical compositions, with significant SiO2, Al2O3 and Na2O contents of the beach sand samples further indicating that quartz and feldspar are the main constituents. Detritus was derived from quartz-rich sources, and quartz dilution strongly influences the bulk chemistry of the beach sands. Positive correlation of most elements with Al2O3 and negative correlation with SiO2 suggests quartz dilution is the main control on chemistry. The sediments were derived from relatively felsic source rocks. Key words: Chūgoku Mountains, Tottori Prefecture, beach sand, geochemistry, quartz, feldspar area is thus needed. Introduction The purpose of this study is to describe the geochemical The compositions of coastal sediments are influenced by compositions of fifteen beach sand samples collected from numerous components and processes, including source ten sites along the shoreline of Tottori Prefecture in the area composition, sorting, climate, relief, long shore drift, and where the Sendai and Tenjin Rivers supply sediments. -
RIVERS of JAPAN by Matthew C
RIVERS OF JAPAN by Matthew C. Perry The rivers of Japan add to the beauty and charm of this country that complement the many other positive attributes Japan has to offer travelers. Japan is blessed with many rivers due to the large watersheds of the volcanic mountains in the interior that collect water and move it to the sea. The rivers often have such a steep descent that once a Dutch engineer stated, “This is not a river, but a waterfall.” In recent years, I have seen many rivers as I traveled to various areas as part of a cultural exchange program sponsored by the Manjiro Whitfield Commemorative Center for International Exchange. These trans-continental friendship trips between the USA and Japan are sponsored annually to obtain a better understanding of the cultures of our two countries. Unfortunately, my involvement with rivers in Japan is often limited to being a viewer from a bus, where I have been forced to take a quick photograph and then use my imagination of what beauty and adventure await upstream. One of the prettiest and best known of the rivers in Japan is the Shimanto Gawa (River) in Kochi Prefecture on the island of Shikoku. I saw this river while traveling to Tosashimizu, the home city of Manjiro Nakahama, the first Japanese to live in the USA. This 196 kilometer river is believed to be the last clear stream in Japan due to the lack of dams. It has good fishing and, in some parts, is used for the collection of nori (seaweed). The fish preferred by fishermen in the Shimanto River is the Ayu (sweetfish). -
Potential Use of Extremely High Biomass And
Zoological Studies 43(2): 165-172 (2004) Potential Use of Extremely High Biomass and Production of Copepods in an Enclosed Brackish Water Body in Lake Nakaumi, Japan, for the Mass Seed Production of Fishes Shin-ichi Uye1,*, Shinobu Nakai1 and Moriyuki Aizaki2 1Graduate School of Biosphere Sciences, Hiroshima University, 4-4-1 Kagamiyama, Higashi-Hiroshima 739-8528, Japan Tel: 81-824-247940. Fax: 81-824-227059. E-mail: [email protected] 2Faculty of Life and Environmental Sciences, Shimane University, Matsue 690-8504, Japan Tel: 81-852-326582. Fax: 81-852-326598. E-mail: [email protected] (Accepted January 3, 2004) Shin-ichi Uye, Shinobu Nakai and Moriyuki Aizaki (2004) Potential use of extremely high biomass and pro- duction of copepods in an enclosed brackish water body in lake Nakaumi, Japan, for the mass seed production of fishes. Zoological Studies 43(2): 165-172. We found extremely high abundance, biomass, and production rates of mesozooplankton in an enclosed brackish water body (called the Honjo District) in Lake Nakaumi, Japan, during a 2-yr investigation. To the best of our knowledge, the overall biomass mean of 71.0 mg C m-3 is one of the highest values recorded so far anywhere in the world. Copepods dominated the zooplankton com- munity in terms of abundance (94.4%) and biomass (83.4%). Zooplankton biomass and production rates were twice as high in Honjo District as those in adjacent Lake Nakaumi, although the phytoplankton chlorophyll α concentration was twice as low. Two reasons for the enhanced zooplankton standing stock in Honjo District might be the development of weak benthic deoxygenation and lower numbers of planktivorous fish. -
MATSUE and IZUMO-TAISHA SHRINE PAGE 1/ 4
MATSUE and IZUMO-TAISHA SHRINE PAGE 1/ 4 PG-601 MATSUE and IZUMO-TAISHA SHRINE MATSUE AND VICINITY Matsue (松江), pop. 150,000, the capital city of Shimane myths and legends of yesteryear Japan. The city is especially well Prefecture, commonly known as the “City of Water,” lies at the known among foreigners and Japanese students studying English point where the Nakaumi Lagoon connects with Lake Shinji. because of its association with Lafcadio Hearn, the author of Matsue is an old castle town forming the heart of Izumo many books on Japan, (1850–1904), who assumed the Japanese Province (present-day Shimane Prefecture), a veritable “treasure name of Yakumo Koizumi after his naturalization. house” of cultural assets and historic sites closely related to the Access By Air: To From Operated by Time required One-way fare Daily flights Access from / to downtown Izumo Tokyo JAS 1 hr. 30 min. ¥26,500 4 40 min. by bus from JR Matsue Sta. (¥890) By Train (to Matsue): Daily From Type of Train Time required runs Fare Remarks Tokyo Sleeping train “Izumo” 13 hrs. 40 min. 1 ¥20,790~ depart Tokyo at 21:10 Limited Express train “Super Hakuto” 5 hrs. 10 min. 5 ¥9,000 depart Osaka at 7:37, 10:22 Osaka to Kurayoshi, then local train to 12:52, 14:52, 17:39 Matsue. Okayama Limited Express train “Yakumo” 2 hrs. 50 min. - 3 hrs. 10 min. 15 ¥5,360 Kyoto Limited Express train "Super Hakuto" to 5 hrs. 30 min. 5 ¥10,920 depart Kyoto at 7:06, 9:51 Kurayoshi, then local train to Matsue. -
Title ECOLOGY and BIOLOGICAL PRODUCTION of LAKE
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Kyoto University Research Information Repository ECOLOGY AND BIOLOGICAL PRODUCTION OF LAKE Title NAKA-UMI AND ADJACENT REGIONS -4. DISTRIBUTION OF FISHES AND THEIR FOODS- Kawanabe, Hiroya; Saito(Tezuka), Yoko; Sunaga, Tetsuo; Author(s) Maki, Iwao; Azuma, Mikio SPECIAL PUBLICATIONS FROM THE SETO MARINE Citation BIOLOGICAL LABORATORY (1968), 2(2): 45-73 Issue Date 1968-09 URL http://hdl.handle.net/2433/176454 Right Type Departmental Bulletin Paper Textversion publisher Kyoto University Spec. Pub!. Seto Mar. Bioi. Lab. Series II. Part II, September, 1968. ECOLOGY AND BIOLOGICAL PRODUCTION OF LAKE NAKA-UMI AND ADJACENT REGIONS 4. DISTRIBUTION OF FISHES AND THEIR FOODS'l HIROYA KAWANABE, YOKO TEZUKA SAIT02l, TETSUO SUNAGNl, lWAO MAKPJ and MIKIO AZUMNJ Department of Zoology, Faculty of Science, Kyoto University, Kyoto With 6 Text- figures and 10 Tables Along the coast of Japan Sea are many brackish lakes and lagoons, which are separated from the sea by sand-dunes or sand-bars. Lake Naka-umi is the largest one located on the border of the Shimane and Tottori Prefectures. The characteristic situation of it is that it joins to a lake, Shinji-ko, and to Miho Bay on opposite sides of it through narrow water-courses, namely River Ohashi-gawa and the Sakai Channel respectively (Fig. 1). The hydrographic conditions and the distribution, abundance and mode of life of organisms are varied greatly among these three bodies of water and from season to season. Such situation has aroused interests of limnologists and oceanographers, and several papers have been published on hydrological conditions, plankton organisms and benthic animals (e.g., CHIBA, 1959; CHIBA and KoBAYASHI, 1951; ISHII, 1931 ; KAZIKA W A, 1955 ; KAZIKA WA et al., 1951, 1952a, 1952b, 1956, 1957 ; MIYADI et al., 1945, 1952, 1954; MIZUNO, 1965; SHIBUYA, 1955; SUDA et al., 1951 ; UENO, 1955).