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首页> 外文期刊>Journal of Hydrology >An insight into water stable isotope signatures in temperate catchment
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An insight into water stable isotope signatures in temperate catchment

机译：对温带集水区水稳定同位素签名的洞察

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Stable isotopes are used to decipher hydrological processes in watershed research. A two-year monthly monitoring of hydrogen and oxygen stable isotope ratios (delta H-2 and delta O-18) in a temperate catchment in Norther Europa, Latvia was undertaken. Isotope ratios in common water types - raised bog, confined groundwater, unconfined groundwater and surface water - were measured. We found characteristic signatures of isotope ratios for each of these four water types. The average isotope ratios of different water types ranged from -80.8 to -68.3 parts per thousand for delta H-2 and -11.46 to -8.76 parts per thousand for delta O-18, with standard deviations from 18 to 25 parts per thousand and 0.10 to 1.59 parts per thousand, respectively. The isotope ratios of the stream base flow were consistent with the groundwater isoscape and seasonally enriched by evaporation. Most enriched water are found in raised bogs and large lakes. The most depleted water is found in a spring discharging phreatic groundwater in a forest site with sandy soil. The most enriched water was associated with significant short-lived precipitation events, resulting in impoundment of water on the land surface and its enrichment due to evaporation. The novelty of this study is that this enriched isotope signal is propagated throughout the hydrological system, temporarily albeit significantly shifting isotope ratios of phreatic groundwater and surface runoff. Further case studies are needed to affirm if this is a regionally significant mechanism controlling isotope ratios of surface and subsurface water. The observed difference between the average delta O-18 of phreatic groundwater at two locations was 0.9 parts per thousand. We suggest that the differences are due to different land use and soil conditions.
机译：稳定同位素用于破译流域研究中的水文过程。在拉脱维亚的温带集水中，在拉脱维亚的温带集水区中对氢气和氧稳定同位素比率（Delta H-2和Delta O-18）进行了两年的每月监测。测定了普通水类型的同位素率 - 升高的沼泽，密闭的地下水，非整合地下水和地表水。我们发现这四种水类型中的每一种同位素比的特征签名。不同水类型的平均同位素比率为-80.8至-68.3份，ΔH-2和-11.46至-8.76份达到-8.76份，适用于ΔO-18，标准偏差为18至25份每千份和0.10分别为每千人1.59份。物流碱流量的同位素比与地下水均匀均匀，并通过蒸发季节性富集。在凸起的沼泽和大湖泊中发现了最丰富的水。最耗尽的水在一个森林遗址的春季排出的潜水地下水中发现。最丰富的水与显着的短暂降水事件有关，导致土地表面上的水蓄水及其浓缩引起的蒸发。该研究的新颖性是，该富集的同位素信号在整个水文系统中繁殖，暂时虽然显着地转化了潜水地下水和表面径流的同位素比率。需要进一步的案例研究来确认这是控制表面和地下水同位素比的区域重要机制。两个地点的潜水地下水的平均δO-18之间观察到的差异为0.9份‰。我们建议差异是由于土地利用和土壤条件不同。

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