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CST-9A: Coastal Environmental Problems
ADVANTAGES OF FERTILIZER FOR ALGAE ENHANCEMENT TECHNOLOGY
Kenji Hotta1 Kyoichi Okamoto1 and Tetsuo Suzuki2
1Department of Oceanic Architecture and Engineering, Nihon University Funabashi, Chiba, JAPAN
hotta@ocean.cst.nihon-u.ac.jp
2CELSS: Coastal Environmental Lab. Shizuoka, JAPAN
Fishery resources in the world are decreasing year
by year. Those reasons are over catching, change of habitable environments caused
by pollution, global environmental change can be pointed out. As the result, especially,
seaweed communities which support marine ecosystems are decreasing in the ocean.
Algae enhancement technology is, therefore, the most important to improve the
living environment of the seaweed communities.
Ferrous sulfate is a micronutrient elements considered essential to all algae. Ferrous sulfate that is used is an industrial waste which comes from processing titanium ore and it is very expensive to treat this waste. Slag that is used as a core material is also a waste material for steel works.
Our special point is to use ocean fertilizer technology, especially, by throwing type of Iron fertilizer. It becomes harmless that this type of Iron fertilizer had transferred the basic behavior of the slag with ferrous sulfate. Our object is to apply algae enhancement technology to real ocean zone by using this throwing type of Iron fertilizer. In this paper, method of fertilizer production and results of application will be introduced and discussed.
CST-9A: Coastal Environmental Problems
POLYCHLORINATED ORGANIC CONTAMINANTS IN SURFACE SEDIMENTS FROM THE YANGTZE ESTUARY, CHINA
M. Liu, Y. Yang, L. Hou, S. Xu, D. Ou, B. Zhang and Q. Liu
Department of Geography Open Laboratory of Urban Environmental Process of the State Ministry of Education East China Normal University Shanghai, CHINA
mliu36@public9.sta.net.cn
Polychlorinated Organic Contaminants (PCOCs), PCBs and organochlorine pesticides (OCPs) in surface sediments taken from intertidal flats in the Yangtze Estuary and coastal area were determined by GC-ECD. The results indicate that residue patterns of POCPs was in the order of BHCs>PCBs>DDTs. The total concentration of PCBs ranged from 0.187-18.948ng/g and mean concentration level is 2.500ng/g. Tri-chlorinated compound was predominant congener. This finding is in accordance with the fact that Tri-CB residue was dominant pollutant in China. The concentration levels of total PCBs varied dramatically with region. They are characterized by near sewage discharge maximum, followed by decreased levels among the sites where there are no obvious sources of effluent discharges. The OCPs levels varied from 1.245-36.009 ng/g with an average of 8.503ng/g. The distribution pattern for OCPs was similar to that of PCBs, suggesting similar sources. BHCS and aldrin residues were predominant compounds for OCPs, showing that both residues were local special organochlorine pesticides in the study area. Moreover, the degree of sediment contamination by PCBs and OCPs in study area is low compared to other estuarine and tidal flat surface sediments, and lower than the effects range low (ER-L) values, indicating that adverse biological effects were not obvious presently. However, the potential for biological effects is still considered matter of concern due to long-tern exposure to estuarine and coastal ecosystem.
CST-9A: Coastal Environmental Problems
A STUDY OF THE RELATION BETWEEN HUMAN AND NATURE THROUGH THE VIEWPOINT OF TIDELAND -- A CASE STUDY OF BANZU TIDELAND
Shibagaki Taro and Kuroyanagi Akio
Department of Oceanic Architecture and Engineering, Nihon University Chiba, JAPAN
K15003@ocean.cst.nihon-u.ac.jp
This research was conducted at the BANZU tideland in the Kisarazu City, Chiba Prefecture, Japan. The BANZU tideland is the natural tideland which is left on the Tokyo bay. Then, on the Tokyo bay, it is the tideland which has maximum area. Also, this study is the one to make the role of the tideland to the area society clear. Therefore, on the BANZU tideland, it did literature and hearing investigation. It grasped a creature inhabiting situation around the BANZU tideland from the literature investigation. On the other hand, it grasped a difference in the consciousness to the tideland of the habitant and the citizen from the hearing investigation. Moreover, it grasped interchange between the habitant and the citizen in the tideland.
As the result, it made the following clear.
・ The development which was done around the BANZU tideland aggravated creature
inhabiting environment. Then, the creature which cannot be adaptable to the aggravation of the environment decreased and became extinct. As a result, it brought a change to the daily concerning by the tideland with the habitant. Moreover, it brought a change to the consciousness of the habitant, too.
・ The development, which was done around the BANZU tideland, changed a form of the life of the habitant. Then the element, which forms community of the common topic and the common work and so on decreased. As a result, the area consciousness thinned. With this thing, the interest and the interest in the tideland of the habitant faded away. Then, the existence value on the tideland changed.
・ The movement, which tries to preserve a BANZU tideland, was not the habitant who concerns a tideland daily and was done mainly in the citizen.
CST-9A: Coastal Environmental Problems
ANALYSIS OF DISSOLVED OXYGEN AND FISH EGGS AND LARVAE IN A BAY
Yoshihiro Suenaga, Koichi Masuda, Takashi Sasaki, Hee-Do Ahn and Tetsuro Kobayashi
Faculty of Engineering, Kagawa University Takamatsu, Kagawa, JAPAN
suenaga@eng.kagawa-u.ac.jp
Coastal aquaculture has been increased and developed in a semi-enclosed bay. In Sido Bay, located northeast side of Kagawa Pref., could produce marine aquaculture productions to supply the population demands. The feeding rate of fish farming is approximately 12,378 tones a year, with the highest rate in summer. Therefore, the pollution from floating aquaculture cage can affect the environment via fecal waste, dissolved waste and excess feed settles. After the field experiments, it was found the tidal current, bottom topography and DO consumption rate by sediment are important factors to evaluate the carrying capacity of aquaculture grounds. The authors proposed a more appropriate evaluation method for distribution of DO and transportation of fish eggs and larvae by using 3-dimensional Euler-Lagrangian numerical model and taking the effect of oxygen consumption by the fish in the aquaculture cage and bottom sediment into consideration.
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