巴西热带稀树草原联邦区浅层含水层补给潜力和有效补给——GLDAS-2、地下水位波动(WTF)和降雨模式耦合分析

IF 1.7 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
André Walczuk , José Eloi Guimarães Campos , Lucas Santos Batista Teles
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引用次数: 0

摘要

含水层补给是水管理的一个关键参数。降雨模式的变化与水汽带性质和蒸散发等外部因素共同决定了地下水的波动。这些变量在含水层时间响应中的不同组合可能导致水收支不平衡,威胁到地表和地下水的可用性。综合多种方法评价地下水的潜在补给和有效补给是认识地下水行为的重要途径。本研究对巴西联邦区的多孔含水层进行了分析。该地区与国内和国际水资源生产相关,因为它拥有三个水文区域的源头:亚马逊、托坎廷-阿拉瓜亚和帕拉纳 /巴拉圭。潜在补给估计和亏缺期的描绘是从国家气象研究所(INMET)气候网络中汇编的,并已被发现是支持降雨分布分析的合适数据库。基于GLDAS-2/GRACE地下蓄水模型(GWS)的地下水位波动- WTF法,结合5口监测井的水位时间序列,估算有效补给量。根据卫星资料,对应水文年降雨量的22-40%转化为饱和带补给。直接观测估计值为22-48%。GWS和WL的Spearman相关系数高达0.90,因此模型时间序列对趋势分析是可靠的。对气候和地下水位资料的耦合分析表明,移动平均降雨量很好地描述了地下水的位置。理想的窗口期在150至270天之间,取决于地下水深度,后者最具代表性。联邦区多孔含水层的管理研究可以考虑至少2年的降雨时间序列。维持总体积,但沿该窗口的非典型或不均匀分布有可能在旱季结束时改变水头和随后的地下水位上升期。塞拉多生物群系的未来工作可以考虑本文提出的方法来证实研究结果,并扩大评估的地貌和土壤位置的多样性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Potential and effective recharge of the Federal District shallow aquifers, Brazilian savanna region - coupled analysis of GLDAS-2, Water Table Fluctuation (WTF) and rainfall pattern
Aquifer recharge is a key parameter for water management. Rainfall pattern shifts combined with external factors such as vadose zone properties and evapotranspiration determine groundwater fluctuation. Different combinations of these variables within aquifer time response might cause a disequilibrium in water budget, threatening both surface and groundwater availability. An important approach to understanding groundwater behavior is the evaluation of potential and effective recharge considering multiple methodologies. This study provides an analysis of the porous aquifer of the Federal District, Brazil. The area is relevant for national and international water production, as it hosts the headwaters of three hydrographic regions: Amazonas, Tocantins-Araguaia, and Paraná/Paraguay. Potential recharge estimations and delineation of deficit periods were compiled from the National Institute of Meteorology (INMET) climatic network and have been found to be a suitable database to support rainfall distribution analysis. Effective recharge was estimated based on the water table fluctuation - WTF method applied to GLDAS-2/GRACE groundwater storage model (GWS) and water level time series of five monitoring wells. According to the satellite data, 22–40% of the corresponding hydrological year rainfall is converted into saturated zone recharge. Direct observations estimations are 22–48%. Spearman's correlation coefficients for GWS and WL are up to 0.90, so that modeled time series are reliable for trend analysis. A coupled analysis of climatic and water table data has shown that groundwater position is well described by moving average rainfall. Ideal windows were found to be between 150 and 270 days and dependent on groundwater depth, with the latter being the most representative. The study of Federal District porous aquifer for management purposes could consider a minimum of 2-year rainfall time series. Maintenance of total volume but atypical or unevenly distribution along this window has the potential to alter hydraulic head by the end of the dry season and the subsequent water table ascension period. Future work at the Cerrado Biome can consider the methods herein presented to corroborate research findings and expand the variety of geomorphological and pedological locations evaluated.
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来源期刊
Journal of South American Earth Sciences
Journal of South American Earth Sciences 地学-地球科学综合
CiteScore
3.70
自引率
22.20%
发文量
364
审稿时长
6-12 weeks
期刊介绍: Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.
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