Stream Catchment Interaction Controlling DOC Concentration and Composition under Varying Flow Regimes in Rocky Mountain Streams

落基山溪流不同流态下溪流流域相互作用控制 DOC 浓度和组成

基本信息

批准号：
9628368
负责人：
George Hornberger
金额：
$ 30万
依托单位：
University of Virginia Main Campus
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1996
资助国家：
美国
起止时间：
1996-09-01 至 2001-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9628368&HistoricalAwards=false
关键词：
Stream Catchment Interaction Controlling DOC

项目摘要

9628368 Hornberger In many catchment-stream systems, the concentration and composition of dissolved organic material (DOM) is a critical water quality characteristic. Examples of processes controlled by DOM interactions are: 1) complexation of trace metals by the humic fractions of DOM which control both trace metal transport and bioavailibility; 2) enhancement of the solubility of hydrophobic organic contaminants; 3) formation of trihalomethanes in drinking water as a result of interactions between Chlorine and components of the DOM during water treatment; and 4) absorption of visible and UV radiation by DOM and generation of photoproducts. The DOM also can have indirect effects on water quality by influencing internal processes of aquatic ecosystems, e.g., photosynthesis and heterotrophic activity. In this proposal, we advance a plan of study to investigate in-stream processes and their interaction with catchment processes in determining the spatial and temporal patterns of quantity and quality of DOC in streams in the Rocky Mountains. The research tasks will include experimental additions of DOC-enriched water to stream segments to quantify interactions in the hyporheic zone, field monitoring to deermine synoptic spatial patterns along stream channels and in hillslope lysimeters of amounts and composition of DOC, and the extension of mathematical models to interpret the results. Studies of the in-stream processes will include continuing assessment of the roles of near-stream and catchment-scale processes.

9628368 Hornberger在许多集水流系统中，溶解有机材料（DOM）的浓度和组成是关键的水质特征。由DOM相互作用控制的过程的示例是：1）通过控制痕量金属传输和生物利用度的DOM的腐殖质分数对痕量金属的络合； 2）增强疏水有机污染物的溶解度； 3）由于水处理期间氯与成分之间的相互作用，饮用水中的三甲米甲烷形成； 4）通过DOM和光产生的产生吸收可见和紫外线辐射。 DOM还可以通过影响水生生态系统的内部过程，例如光合作用和异营养活性来对水质产生间接影响。在此提案中，我们提出了一项研究计划，以研究沿流程的过程及其与集水过程的相互作用，以确定落基山脉中DOC的空间和时间量的空间和时间模式。研究任务将包括将富含DOC的水的实验性添加到溪流段中，以量化低音区域中的相互作用，沿河流通道和DOC的数量和组成的山坡溶作剂的野外空间模式以及DOC的组成以及用于解释结果的数学模型的遗传。对浏览过程的研究将包括持续评估近流和集水尺度过程的作用。