首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Water isotope technology application for sustainable eco-environmental construction: Effects of landscape characteristics on water yield in the alpine headwater catchments of Tibetan Plateau for sustainable eco-environmental construction
【24h】

Water isotope technology application for sustainable eco-environmental construction: Effects of landscape characteristics on water yield in the alpine headwater catchments of Tibetan Plateau for sustainable eco-environmental construction

机译:同位素技术在可持续生态环境建设中的应用:景观特征对青藏高原高山水源流域可持续生态环境建设中水产量的影响

获取原文
获取原文并翻译 | 示例
       

摘要

Topography-climate-vegetation-runoff relationships are important issues in hydrological studies. In this paper, based on analyzing water isotope characteristics of river water, the influence of these variables on the relative contribution of rain to river water was investigated during one rain event in the Heishui Valley of the upper Yangtze River in China. During one rain event on August 19, 2005, a total number of 182 river water samples were collected at 13 sampling sites located along the principal river course and its tributaries. The analysis of water isotopes in the principal river course and its tributaries showed that new rain water and secondary evaporation precipitation caused great variation in values of delta D and high d-excess increased with altitude. Based on calculations of two-component hydrograph separation using delta O-18, the results showed that the biggest relative contribution of new rain to river water (43%) was found in tributary B, while the smallest contribution (less than 5%) was found in tributary I. According to stepwise linear regression analysis, topography (elevation and slope) was the most important factor affecting the contributions of new rain to river water. When only vegetation variables were considered in the regression model, alpine shrub coverage proved to be negatively correlated with the contributions of new rain to river water, while alpine meadow coverage was positively correlated with the contributions of new rain. This would imply that increasing the relative coverage of alpine shrubs in this mountainous region of China may decrease the risk of flooding. (C) 2014 Elsevier B.V. All rights reserved.
机译:地形-气候-植被-径流关系是水文研究中的重要问题。本文在分析河流水同位素特征的基础上,研究了长江上游黑水河谷一次降雨事件中这些变量对降雨对河流水相对贡献的影响。在2005年8月19日的一次降雨事件中,在主要河道及其支流沿线的13个采样点采集了总共182个河水样品。对主要河道及其支流中的水同位素分析表明,新的雨水和二次蒸发降水导致δD值变化很大,并且随着海拔的升高,d过量增加。根据使用三角洲O-18进行的两分量水位分离计算,结果表明,支流B中新雨对河水的相对贡献最大(43%),而最小的贡献(小于5%)为根据逐步线性回归分析,地形(海拔和坡度)是影响新雨对河水贡献的最重要因素。在回归模型中仅考虑植被变量时,高寒灌木覆盖率与新降雨对河水的贡献呈负相关,而高寒草甸覆盖度与新降雨的影响呈正相关。这意味着在中国这个山区增加高山灌木的相对覆盖率可能会降低发生洪灾的风险。 (C)2014 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号