高平原含水层农业用水的时间趋势及其与水文气候因素的关系

IF 2.6 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL Journal of The American Water Resources Association Pub Date : 2023-05-14 DOI:10.1111/1752-1688.13133
Lei Ji, Gabriel B. Senay
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引用次数: 1

摘要

高平原含水层(HPA)是美国大平原农业灌溉的主要水源。在过去几十年中,含水层许多地方的水位稳步下降,因为取水速度超过了补给速度,这一直是该地区水资源管理的一个严重问题。我们在网格、县或地区尺度上评估了1985年至2020年不同时期HPA地区农业用水和水文气候变量的时间趋势和变化,包括降水、气温、参考蒸散、径流、地下水位和陆地蓄水量。结果显示,抽水量从21.3下降 km3/年(1985年至18.2年) 2015年km3/年,而灌溉农田从71928亩增加 1985年至78464平方公里 2015年,整个HPA面积为km2。1985年至2020年,水文气候时间序列显示,北部HPA大部分地区呈湿润趋势,但南部地区呈干燥和变暖趋势。地下水位时间序列显示,北部呈平缓趋势,但中部和南部HPA呈显著下降趋势。整个HPA的灌溉用水和灌溉面积的趋势受到灌溉系统和技术的进步以及可持续用水管理的控制,但也受到水文气候条件的动态变化的影响。
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Temporal trends in agricultural water use and the relationships to hydroclimatic factors in the High Plains aquifer region

The High Plains aquifer (HPA) is the primary water source for agricultural irrigation in the US Great Plains. The water levels in many locations of the aquifer have declined steadily over the past several decades because the rate of water withdrawals exceeds recharge, which has been a serious concern to the water resources management in the region. We evaluated temporal trends and variations in agricultural water use and hydroclimatic variables including precipitation, air temperature, reference evapotranspiration, runoff, groundwater level, and terrestrial water storage across the HPA region for different periods from 1985 to 2020 at the grid, county, or region scale. The results showed that water withdrawals decreased from 21.3 km3/year in 1985 to 18.2 km3/year in 2015, while irrigated croplands increased from 71,928 km2 in 1985 to 78,464 km2 in 2015 in the entire HPA. The hydroclimatic time-series showed wetting trends in most of the northern HPA, but drying and warming trends in the southern region from 1985 to 2020. The groundwater level time-series indicated flat trends in the north, but significant declining in the central and southern HPA. Trends in irrigation water withdrawals and irrigation area across the HPA were controlled by the advancement of irrigation systems and technologies and the management of sustainable water use, but also were affected by dynamical changes in the hydroclimatic conditions.

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来源期刊
Journal of The American Water Resources Association
Journal of The American Water Resources Association 环境科学-地球科学综合
CiteScore
4.10
自引率
12.50%
发文量
100
审稿时长
3 months
期刊介绍: JAWRA seeks to be the preeminent scholarly publication on multidisciplinary water resources issues. JAWRA papers present ideas derived from multiple disciplines woven together to give insight into a critical water issue, or are based primarily upon a single discipline with important applications to other disciplines. Papers often cover the topics of recent AWRA conferences such as riparian ecology, geographic information systems, adaptive management, and water policy. JAWRA authors present work within their disciplinary fields to a broader audience. Our Associate Editors and reviewers reflect this diversity to ensure a knowledgeable and fair review of a broad range of topics. We particularly encourage submissions of papers which impart a ''take home message'' our readers can use.
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