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首页> 外文学位 >Contributions of Karst groundwater to water quality and quantity in a mountain river basin: The Kaweah river, Sequoia and Kings canyon national parks, California.
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Contributions of Karst groundwater to water quality and quantity in a mountain river basin: The Kaweah river, Sequoia and Kings canyon national parks, California.

机译：喀斯特地下水对山区流域水质和水量的贡献：加利福尼亚州的Kaweah河，红杉和金斯峡谷国家公园。

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摘要

Under current climate conditions, hydrology of Sierra Nevadan rivers is primarily controlled by three mechanisms: rainfall-runoff, snow accumulation and seasonal melting, and groundwater recharge, storage, and subsequent discharge. Snowmelt and groundwater storage provide temporal distribution of the seasonal precipitation and support stream flows during the annual dry season. The role of snowmelt hydrology in biogeochemical processes and maintaining river discharge has been the focus of numerous studies. However, the extent to which groundwater contributes to discharge and the temporal distribution of water in these systems has not previously been quantified. To address this need, field documentation of karst springs in the Kaweah River basin was conducted from 2010 -- 2012. These data show that karst springs fall into two distinct categories: one with high seasonality and another with minimal seasonal variation in flow and chemistry. A more in depth look at Big Spring (low seasonal variability) and Tufa Spring (high seasonal variability) show that most low flow discharge from these aquifers is water that was stored within the aquifer, rather than quick flow through the system via large conduits. This pattern of water storage also plays a role in controlling nutrient movement through these karst groundwater systems. Finally, when karst of the Kaweah basin is taken as a whole, it represents a large component of baseflow river discharge, likely controlling the baseflow characteristics of the river.
机译：在当前的气候条件下，内华达山脉河的水文学主要由三种机制控制：降雨径流，积雪和季节性融化以及地下水补给，存储和后续排放。融雪和地下水的储存提供了季节性降水的时间分布，并在年度干旱季节提供了支持性水流。融雪水文学在生物地球化学过程和维持河流流量中的作用一直是众多研究的重点。但是，这些系统中地下水对排放的贡献程度和水的时间分布以前尚未量化。为了满足这一需求，从2010年至2012年对Kaweah河流域的岩溶泉进行了现场记录。这些数据表明，岩溶泉分为两类：一类具有较高的季节性，另一类在流量和化学上具有最小的季节性变化。从大泉（季节性变化低）和图法泉（季节性变化大）更深入地研究表明，这些含水层的大部分低流量排放是存储在含水层中的水，而不是通过大型管道快速流经系统的水。这种储水方式在控制这些岩溶地下水系统中的养分运移方面也发挥着作用。最后，如果将整个喀威盆地的喀斯特地貌作为一个整体，它代表着底流河水的很大一部分，可能会控制该河的底流特征。

著录项

  • 作者

    Tobin, Benjamin W.;

  • 作者单位

    Texas State University - San Marcos.;

  • 授予单位 Texas State University - San Marcos.;
  • 学科 Hydrology.;Biology Ecology.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 198 p.
  • 总页数 198
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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