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第19回GCOEセミナー

第19回GCOE-ARSセミナーの案内をさせていただきます。
興味をお持ちの方は是非ご参加下さい。
第20回、21回と日時が前後しますが、お間違えのないようにお願いします。

日時: 2011年10月12日(水)15:00~17:00

当初13:00-15:00でお知らせしておりましたが、15:00-17:00に時間が変更しました。

場所: 京都大学宇治キャンパス 防災研究所大会議室 (S-519D)

講演者:

(1)戸田祐嗣(名古屋大学 大学院工学研究科 社会基盤工学専攻 准教授 )

生態系サービス評価に基づいた流域圏の自然共生型環境管理
~ 伊勢湾流域圏を事例として ~

Eco-compatible management of river basin complex based on ecosystem service evaluation
~ case of Ise-bay river basin complex ~

Abstract:

River basin is a unit of natural runoff process and it can be considered as an assembly of flux network of water and various materials including sediment and nutrients. Inside a river basin, various landscapes are distributed, and landscape is composed of physical background, bio-chemical actions and biological aspects in associated with the local ecosystem. When the fluxes pass through a landscape, they are changed in quantity and quality and bring about various ecosystem services. Due to population increase and economic efficiency with urbanization, artificial facilities and flux networks have been added to connect multiple basins. These artificial systems have consumed fossil fuels, emitted green house gas, and degraded ecosystem. Outflow fluxes from multiple rivers degrade our facing coastal area in particular bay area. Multiple river basins connected with artificial flux networks, including a facing bay area, is here called river basin complex, where eco-compatible management methodology is required.

In the seminar, I would like to itroduce an integrated numerical model for eco-compatible management of river basin complex around Ise bay in Japan, which includes following 2 sub-models: (1) Flux network model and (2) Ecosystem models of various landscapes. The model can describe the change of the material fluxes and ecosystem services under the various social scenarios on the Ise bay river basin complex.

 

(2)白川直樹(筑波大学 大学院システム情報工学研究科 准教授)

環境流量のグローバルモデリングに向けて ~地域の自然条件と河川流量~

How much water should we allocate to river environment?
-Toward global environmental flow modeling-

Abstract:

We cannot maintain healthy river environment without sufficient river flow inside the channel. That means some portion of water must be left instream, although offstream use of water resources play vital role in our civilization. Environmental flow management intends to satisfy both demands (human and natural environment) effectively, but there are a wide variety of values to be considered, different from place to place. Global water assessment should include environmental water needs anyway.

In some preliminary studies, around 30% of annual mean flow is said to be necessary to keep river healthy under ceartain climate condition. In Japan 0.3 cubic meter per second per 100 square kilometer of drainage area has been used in hydropower plants in mountainous region as a standard value of environmental flow. More detailed analysis has been done in streams in semiarid regions based on some environmental flow setting methodologies.

Not only minimum flow but also disturbance would be important in many part of the world including Asian monsoon regions.

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