2013年-世界发展银行全球_Indus_Basin_of__Pakistan___Impacts_of_Climate_Risks_on_Water_and_Agriculture_187页_6mb

Summary of The Indus Basin of Pakistan: The Impacts of Climate Risks on Water and Agriculture

Core Content

This report, The Indus Basin of Pakistan: The Impacts of Climate Risks on Water and Agriculture, provides an in-depth analysis of the effects of climate risks on water and agriculture in the Indus Basin. It highlights the vulnerability of Pakistan's agricultural and water systems to climate variability and change, and explores potential adaptation strategies.

Main Objectives

• Assess the impacts of climate risks on water and agriculture in the Indus Basin.
• Evaluate the resilience of the region to climate shocks.
• Analyze the economic and environmental consequences of climate change on the basin.
• Propose adaptation strategies to mitigate risks and enhance sustainability.

Key Findings

1. Climate Risks and Their Impacts

• The Indus Basin experienced significant climate extremes in 2009 and 2010, including a weak monsoon leading to drought and catastrophic monsoon flooding, which affected over 20 million people and caused an estimated $10 billion in damages.
• Climate change is expected to amplify variability in snowfall and glacier melt, which are critical sources of water in the region.
• Monsoon patterns and groundwater levels are subject to change, which may affect the reliability of water supply for agriculture.

2. Water and Agricultural System Overview

• The Indus Basin Irrigation System (IBIS) is the largest contiguous irrigation system in the world and supports food security and water supply across all sectors of the economy.
• IBIS includes 3 major multipurpose reservoirs, 19 barrages, 12 inter-river link canals, 45 major irrigation canal commands, and over 120,000 watercourses.
• Groundwater extraction via private tubewells is a growing component of the irrigation system, but this has led to challenges such as waterlogging and salinization.

3. Agricultural Context and Challenges

• Agriculture contributes 22% to Pakistan's GDP, with 45% of the labor force employed in the sector.
• Agricultural production and yields have increased, but per capita food supply remains below the global average of 2,797 kcal per day.
• Over 25% of the population is estimated to be undernourished, and 57% lack food security, despite rising production.
• The agricultural sector is highly dependent on irrigation due to the arid to semi-arid climate, with about 90% of production coming from irrigated land.
• The proportion of arable land has not increased significantly in recent decades, but the irrigated portion has grown from 65% in 2001 to 75% in 2009.

4. Climate Change and Water Resources

• Snow and glacier melt in the Upper Indus Basin (UIB), particularly in the Hindu-Kush-Karakoram (HKK) region, contribute 50-80% of the total average river flows in the Indus system.
• Climate change is projected to increase variability in the distribution and timing of snowfall, as well as changes in snow and ice melt, which could impact the availability and timing of water resources.
• These changes may have serious implications for managing the basin's water resources, especially in the context of increasing population and demand.

5. Adaptation and Policy Implications

• The report emphasizes the need for adaptation investments to address the risks posed by climate change.
• It evaluates different adaptation scenarios and their potential economic and environmental outcomes.
• The integration of hydrological models (IBMR-2012) with computable general equilibrium (CGE) models allows for a comprehensive assessment of the impacts of climate risks on the economy and agriculture.
• The study identifies policy and institutional challenges, including inflexible and uncertain water allocation mechanisms, low water-use efficiency, and unsustainable groundwater extraction.

Key Views

• Resilience and Adaptation: There is a critical need to assess the country's resilience to climate shocks and to develop adaptation strategies to protect the agricultural and water sectors.
• Integrated Assessment: The report advocates for an integrated approach to assess the interactions between water, agriculture, and the economy.
• Economic and Environmental Trade-offs: Adaptation investments must balance economic benefits with environmental sustainability, particularly in the context of groundwater management and salinization.
• Policy Recommendations: There is a call for improved water management policies, better institutional frameworks, and investment in adaptive technologies to ensure long-term food security and economic stability.

Key Information

• Authors: Winston Yu, Yi-Chen Yang, Andre Savitsky, Donald Alford, Casey Brown, James Wescoat, Dario Debowicz, and Sherman Robinson.
• Year of Publication: 2013.
• Publisher: World Bank.
• License: Creative Commons Attribution 3.0 Unported (CC BY 3.0).
• ISBN (paper): 978-0-8213-9874-6.
• ISBN (electronic): 978-0-8213-9875-3.
• DOI: 10.1596/978-0-8213-9874-6.
• Cover Photo: Donald Alford.
• Cover Design: Naylor Design.

Structure of the Report

Chapters

• Chapter 1: Two Years in the Life of the Indus River Basin — Examines the 2009-2011 period, highlighting the impacts of drought and monsoon flooding.
• Chapter 2: The Current Water and Agriculture Context — Discusses the challenges and policies in the water and agriculture sectors.
• Chapter 3: Hydrology and Glaciers in the Upper Indus Basin — Analyzes the hydrological characteristics and glacier dynamics in the UIB.
• Chapter 4: Future Climate Scenarios — Explores historical and projected climate changes in the Indus Basin.
• Chapter 5: Modeling Water, Climate, Agriculture, and the Economy — Describes the integration of IBMR-2012 and CGE models.
• Chapter 6: Sensitivity and Scenario Results — Presents the outcomes of various climate and adaptation scenarios.
• Chapter 7: The Way Forward — Offers recommendations for policy and investment in the face of climate risks.

Appendices

• Appendix A: Structure of IBMR — Provides details on the model's framework.
• Appendix B: IBMR Updating to IBMR 2008 — Details model modifications and data updates.
• Appendix C: Details of the Pakistan Social Accounting Matrix (SAM) — Explains the economic model used in the study.

Figures and Tables

• Figures: Include hydrological data, economic outcomes, and climate projections.
• Tables: Present statistical data, model parameters, and scenario analyses.

Conclusion

The report underscores the significant vulnerability of the Indus Basin to climate risks and the urgent need for integrated water and agriculture management strategies. It calls for increased investment in adaptation measures and improved institutional frameworks to ensure the sustainability of the region's water and agricultural systems in the face of climate change.