Implications for groundwater recharge from stable isotopic composition of precipitation in Hawai'i during the 2017–2018 La Niña,Hydrological Processes

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Implications for groundwater recharge from stable isotopic composition of precipitation in Hawai'i during the 2017–2018 La Niña
Hydrological Processes ( IF 2.8 ) Pub Date : 2020-09-12 , DOI: 10.1002/hyp.13907
Daniel Dores ₁ , Craig R. Glenn ₁ , Giuseppe Torri ₂ , Robert B. Whittier ₃ , Brian N. Popp ₁

Affiliation

The project captured a subset of the hydrological cycle for the tropical island of O'ahu, linking precipitation to groundwater recharge and aquifer storage. We determined seasonal storm events contributed more to aquifer recharge than year‐round baseline orographic trade wind rainfall. Hydrogen and oxygen isotope values from an island‐wide rain collector network with 20 locations deployed for 16 months and sampled at 3‐month intervals were used to create the first local meteoric water line for O'ahu. Isotopic measurements were influenced by the amount effect, seasonality, storm type, and La Niña, though little elevation control was noted. Certain groundwater compositions from legacy data showed a strong similarity with collected precipitation from our stations. The majority of these significant relationships were between wet season precipitation and groundwater. A high number of moderate and heavy rainfall days during the dry season, large percentage of event‐based rainfall, and wind directions outside of the typical NE trade wind direction were characteristics of the 2017–2018 wet season. This indicates that the majority of wet season precipitation is from event‐based storms rather than typical trade wind weather. The deuterium‐excess values provided the strongest evidence of a relationship between groundwater and different precipitation sources, indicating that this may be a useful metric for determining the extent of recharge from different rain events and systems.

中文翻译：

2017-2018年拉尼娜期间夏威夷稳定的降水同位素组成对地下水补给的影响

该项目捕获了奥阿胡热带岛屿水文循环的一部分，将降水与地下水补给和含水层存储联系起来。我们确定，季节性风暴事件对含水层补给的贡献大于全年基线地形贸易风的降雨。来自一个全岛范围内的雨水收集器网络的氢和氧同位素值，在20个地点部署了16个月，并以3个月的间隔进行了采样，从而为奥阿胡河创建了第一条当地的大气水线。同位素测量受数量效应，季节性，风暴类型和拉尼娜的影响，尽管几乎没有控制海拔。遗留数据中的某些地下水成分与我们站点收集到的降水非常相似。这些重要关系中的大多数是在雨季降水与地下水之间。干旱季节的大量中度和强降雨日，大量基于事件的降雨以及典型NE贸易风向以外的风向是2017-2018年雨季的特征。这表明大部分的湿季降水来自事件型风暴，而不是典型的贸易风天气。氘过量值提供了地下水与不同降水源之间关系的最有力证据，表明这可能是确定不同降雨事件和系统补给程度的有用指标。和典型NE贸易风向以外的风向是2017-2018年雨季的特征。这表明大部分的湿季降水来自事件型风暴，而不是典型的贸易风天气。氘过量值提供了地下水与不同降水源之间关系的最有力证据，表明这可能是确定不同降雨事件和系统补给程度的有用指标。和典型NE贸易风向以外的风向是2017-2018年雨季的特征。这表明，多数雨季降水来自事件型风暴，而不是典型的商风天气。氘过量值提供了地下水与不同降水源之间关系的最有力证据，表明这可能是确定不同降雨事件和系统补给程度的有用指标。

更新日期：2020-11-09

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