世界的な河川デルタにおける海面上昇への適応の物理的限界
Kiara G Lasch1, Jaap H Nienhuis2, Gundula Winter3
1Department of Physical Geography, Faculty of Geosciences, Utrecht University, Utrecht, the Netherlands. k.g.lasch@uu.nl.
Nature communications
|February 14, 2026
まとめ
グローバル・デルタは,現在の戦略を用いて海面上昇に適応できる. 物理的な実現可能性はデルタの特徴によって異なりますが,すべてのデルタには2100年までに少なくとも1つのオプションがあります.
科学分野:
- 環境科学 環境科学
- 気候変動への適応 気候変動への適応
- 沿岸のジオモルフォロジー
背景:
- 海面上昇は,世界のデルタに重大な洪水リスクをもたらす.
- デルタの適応戦略には,前進,保護-閉鎖,保護-開放,対応,撤退などがあります.
- 様々なデルタにわたるこれらの戦略の物理的実現可能性に関する評価は限られている.
研究 の 目的:
- 世界的に海面上昇へのデルタ適応のための物理的なソリューションスペースのファーストオーダー評価を実施する.
- 2100年までに世界中の800近くのデルタで実行可能な適応戦略の範囲を特定すること.
主な方法:
- デルタの適応戦略の物理的実現可能性のグローバル評価.
- 現在の技術,資源,空間的制約の分析.
- 戦略オプションに対するデルタ物理特性の影響の評価.
主要な成果:
- 2100年までに,すべてのデルタに物理的に実現可能な少なくとも1つのデルタ全体の適応戦略が存在します.
- 実行可能な戦略の選択肢は,主にデルタの大きさ,都市化,洪水頻度によって決定されます.
- 大規模で,都市化している,または頻繁に洪水にさらされているデルタは,適応の選択肢が少ない.
結論:
- 現在の能力は,2100年までにすべてのデルタに物理的に実現可能な少なくとも1つの適応戦略を可能にする.
- 将来のイノベーションとデルタ間の協力は,適応の選択肢を広げることができます.
- 資源の制限は,複数のデルタが同時に適応することを要求するので,重大なリスクをもたらす.
関連する概念動画
01:50Global Climate Change
29.1K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
29.1K
01:17The Delta-to-Delta Circuit
1.2K
In a delta-delta configuration, the source and the load are connected in a delta manner, forming a closed loop that divides the network into three distinct phases. This configuration makes the phase voltages identical to line voltages. Assuming the sources are in positive sequence, the phase voltages can be expressed directly without having a neutral wire.
1.2K
01:19The Y-to-Delta Circuit
727
A balanced wye-to-delta circuit comprises balanced Y-connected voltage sources and delta-connected loads with no neutral line connection.
The initial step in analyzing a wye-to-delta circuit is to assume a positive phase sequence. These phase voltages are then utilized to calculate the line voltages that occur directly across the delta-connected load impedances. Van, Vbn, and Vcn are the phase voltages in wye, and Vab, Vbc, and Vca are the line voltages for a delta circuit. The relation between...
The initial step in analyzing a wye-to-delta circuit is to assume a positive phase sequence. These phase voltages are then utilized to calculate the line voltages that occur directly across the delta-connected load impedances. Van, Vbn, and Vcn are the phase voltages in wye, and Vab, Vbc, and Vca are the line voltages for a delta circuit. The relation between...
727
01:16The Delta-to-Y Circuit
909
In the delta-wye circuit, the source is delta-connected, while the load is in a wye configuration. This means that the phase voltage of the delta-connected source is equal to the line voltage of the wye-connected load. The connection between two-line currents originates from the delta-connected source. The phase difference in the balanced system allows for calculating one line current given the other, utilizing the positive sequence of phases. In the delta-wye system, the phase currents in the...
909
02:27Limiting Reactant
70.7K
The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in reality, the reactants are not always present in the stoichiometric amounts indicated by the balanced equation.
70.7K
01:18Rise of Liquid in a Capillary Tube
3.3K
When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
3.3K