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| Assessing Water Scarcity with Explicit Incorporation of Green Water and Environmental Flow Requirement | |
| 项目编号 | 200021_188686 |
| Yang Hong | |
| 项目主持机构 | Swiss Federal Institute of Aquatic Science and Technology - EAWAG |
| 开始日期 | 2020-04-01 |
| 结束日期 | 2021-03-31 |
| 中文摘要 | Water scarcity has become a major constraint to socio-economic development and a threat to livelihood of people in increasing parts of the world. As the largest user of water, agricultural production has been facing unprecedented challenges. Compounding the situation is the future climate change that adds large uncertainties in water availability and demand in time and space. Addressing water scarcity has been set as a primary task in many international programs and initiatives, including the Sustainable Development Goals (SDGs) adopted by the United Nations (UN, 2015). Since the late 1980s, water scarcity assessment has drawn much attention in scientific communities. A number of indicators have been developed to assess water scarcity. Population, water availability and water use are the key elements of these indicators. Most of the progress made in the past decades has been on refining the quantification of water availability and use by applying spatially explicit models. Despite the recognition of importance of green water (soil moisture) for agricultural production, most of the indicators developed so far have ignored it. There is a lack of appropriate approaches to incorporate green water, partly due to its different existence status compared to blue water: the former is in storage and the latter is in flow. Ignoring green water underestimates water availability and use, misleading the assessment results in many places. In addition, water scarcity assessment so far has not explicitly taken into account the environmental flow requirement (EFR) across rivers/regions in the world. Few considered EFR have merely used a pre-fixed percentage for all rivers. The two shortcomings specified here have greatly affected the robustness of the existing indicators in representing the real status of water scarcity across the regions of the world. Furthermore, existing water scarcity assessments have generally been conducted in a static way. No study has addressed historical evolvement as well as future development of water scarcity associated with global changes.With the clear need to improve the water scarcity assessment, the aim of this project is to explore ways to appropriately incorporate green water and EFR in its indicator. In view of the dynamic nature of water scarcity, the assessment will be conducted for the past decades and projected to the future. The concrete tasks include: 1) Building a physically robust water scarcity indicator with incorporation of green water and EFR components; 2) Assessing the existing water availability and water use data from the multi-model simulations and using an ensemble data to assess historical changes in water scarcity with explicit incorporation of green water (from the 1970s to current); 3) Determining EFRs for different river regimes considering ecological status of the systems; 4) Providing integrated global water scarcity assessment incorporating green water and EFR for the present and projecting to the future in the context of climate and water resources/demand changes and associated uncertainties (up to 2050). The whole project is designed for 4 years. A PhD student has been carrying out the work since the late 2017 with the funding secured for 2 years. This project proposal is for applying for the funding to fill in the budget gap during the period Oct. 2019 - Sept. 2021. The conduction of the project has been in consultation and collaboration with experts in the relevant disciplines from Eawag and the network built by the applicant over the years, particularly through the ISI-MIP project (https://www.isimip.org). At the time this proposal is submitted, Task 1) has been more or less completed and Task 2) is ongoing. A journal paper will be submitted based on the results of the first two tasks in late 2019. The SNF funding applied in this proposal is primarily for fulfilling Tasks 3) and 4). The output of the project will provide a robust way for water scarify assessment and will be useful for supporting water resources (scarcity) management. |
| 学科分类 | 10 - 材料科学 |
| 资助机构 | CH-SNSF |
| 项目经费 | 83654 |
| 项目类型 | Project funding |
| 国家 | CH |
| 语种 | 英语 |
| 文献类型 | 项目 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/125567 |
| 推荐引用方式 GB/T 7714 | Yang Hong.Assessing Water Scarcity with Explicit Incorporation of Green Water and Environmental Flow Requirement.2020. |
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