scholarly journals Historical changes in primary production in the Seto Inland Sea, Japan, after implementing regulations to control the pollutant loads

Water Policy ◽  
2018 ◽  
Vol 20 (4) ◽  
pp. 855-870 ◽  
Author(s):  
Satoshi Nakai ◽  
Youhei Soga ◽  
Satoshi Sekito ◽  
Akira Umehara ◽  
Tetsuji Okuda ◽  
...  
Keyword(s):  
Water Pollution ◽  
Environmental Management ◽  
Primary Production ◽  
Seto Inland Sea ◽  
Load Control ◽  
Red Tides ◽  
Pollutant Load ◽  
Nutrient Loadings ◽  
Management Measures ◽  
The Seto Inland Sea

Abstract A total pollutant load control system (TPLCS) was implemented in the Seto Inland Sea in 1979 to reduce the water pollution and the frequency of red tides. We estimated primary production from 1981 to 2010 to determine the effects of reducing the nutrient loadings from the surrounding land. While primary production has decreased overall in the Seto Inland Sea in response to the TPLCS and the associated reductions in the total nitrogen (T-N) and phosphorus (T-P) loads from land since 1981, the reductions were limited to 4 of its 11 subareas. Primary production has increased in the Harima Nada but has been stable in the Bingo Nada subarea, reflecting the fact that the T-N and T-P stocks have not decreased in these subareas over the study years. The inconsistent responses of the 11 subareas suggest that the characteristics of each subarea should be considered when environmental management measures are established and implemented in the Seto Inland Sea. The controls on the nutrient loadings according to the TPLCS should be modified to permit better management of this semi-enclosed sea.

scholarly journals Shift of the Circumstances in Effluent Pollutant Loads and Water Pollution in the Seto Inland Sea.

1998 ◽  
Vol 21 (11) ◽  
pp. 780-788 ◽  
Author(s):  
Tohru SEIKI ◽  
Yukio KOMAI ◽  
Takenobu KOYAMA ◽  
Osam NAGAFUCHI ◽  
Yasuyoshi HINO ◽  
...  
Keyword(s):  
Water Pollution ◽  
Seto Inland Sea ◽  
Pollutant Loads ◽  
The Seto Inland Sea

NEW DIRECTION FOR ENVIRONMENTAL WATER MANAGEMENT IN THE SETO INLAND SEA

2017 ◽  
Author(s):  
Kenichiro Iba ◽  
Kenichiro Iba ◽  
Takuya Ishikawa ◽  
Takuya Ishikawa ◽  
Keizo Negi ◽  
...  
Keyword(s):  
Water Management ◽  
Water Pollution ◽  
Water Quality ◽  
Tidal Flat ◽  
Environmental Water ◽  
Seto Inland Sea ◽  
Temperate Climate ◽  
The Seto Inland Sea ◽  
The Law ◽  
Seaweed Bed

The Seto Inland Sea, the largest enclosed sea in Japan, has unrivalled beauty of archipelago and abundant nature under temperate climate with light rain falls, and the people has been benefitted from the sea ever since the early times. We however experienced sever water pollution problems caused by rapid industrialization and the loss of seaweed bed and tidal flat due to reclamation projects particularly in the period of the high economic growth in 1960s. To resolve these issues, we have carried out water quality improvement programs including reduction of pollutant load based upon the Water Pollution Control Law and the Law concerning Special Measures for Conservation of the Environment of the Seto Inland Sea. As a result, water quality has improved as compared with Tokyo Bay and other enclosed seas. However, there are still severe problems including the occurrence of red tide and oxygen deficient water mass in some areas in the Seto Inland Sea. Securing the bio-diversity, bio-productivity and smooth nutrient circulation are also important. Under these situations, the Law and the Basic Plan for Conservation of the Environment of the Seto Inland Sea were revised in 2015. With these law and plan, it has been made clear that our principal objective is to make the Seto Inland Sea a “Bountiful Sea” through conservation of water quality with bio-diversity and bio-productivity. Also the importance to implement environmental measures corresponding local differences in the respective region and seasonality were indicated. In order to actualize “the Beautiful and Bountiful Seto Inland Sea”, we need to implement environmental water management as follows. 1. Environmental conservation, restoration and creation of coastal areas. 2. Conservation and management of water quality. 3. Conservation of natural and cultural landscapes. 4. Sustainable utilization of fishery resources. Ministry of the Environment, Japan will continue to conduct corresponding programs based on scientific survey and evaluation on conservation/restoration of seaweed bed, tidal flat, smooth circulation of nutrients.

CLIMATE CHANGE IMPACTS ON PRIMARY PRODUCTION AND WATER QUALITY IN THE SETO INLAND SEA UNDER RCP8.5 SCENARIO

2020 ◽  
Vol 76 (2) ◽  
pp. I_1147-I_1152
Author(s):  
Hironori HIGASHI ◽  
Akiko YOKOYAMA ◽  
Satoshi NAKADA ◽  
Hiroshi YOSHINARI ◽  
Hiroshi KOSHIKAWA
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
Primary Production ◽  
Climate Change Impacts ◽  
Seto Inland Sea ◽  
The Seto Inland Sea

scholarly journals Dynamics of Noctiluca scintillans red tides in coastal waters of Harima-Nada, the Seto Inland Sea

2021 ◽  
Vol 30 (3) ◽  
pp. 47-55
Author(s):  
Kuninao Tada ◽  
Ren Chiba ◽  
Saho Kitatsuji ◽  
Daisuke Ishii ◽  
Tetsuo Yanagi
Keyword(s):  
Coastal Waters ◽  
Seto Inland Sea ◽  
Red Tides ◽  
Noctiluca Scintillans ◽  
The Seto Inland Sea
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