Use of oxygen-18 isotope to quantify flows in the upriver and middle reaches of the Heihe River,Northwestern China |
| |
Authors: | Y H Zhang X F Song Y Q Wu |
| |
Institution: | (1) Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, 100101 Beijing, China;(2) School of Environmental Science and Engineering, Shanghai Jiao Tong University, 200240 Shanghai, China |
| |
Abstract: | In recharge areas, the Heihe River flow was separated into components of ice-snowmelt and precipitation according to 14 gauging
stations and to monthly hydrograph using oxygen-18. As shown by the result of the two-component mixing model, on average,
19.8% of the runoff comes from ice-snowmelt. At three stations which are closer to glaciers and with headstream of ice-snow
melted water, the ice-snowmelt runoff is larger than 28% of stream water. In addition, because most of the ice-snowmelt infiltrates
the groundwater, which later discharges into the river at mountain outlets, the ice-snowmelt percentage in runoff is lower
than average at these stations with the elevation higher than 3,600 m. According to monthly hydrograph, the lowest percentage
of ice-snowmelt in runoff is in July (6.46%), whereas during November it is the largest (26.1%). In the middle basin, the
fraction of groundwater in runoff had a marked increase from 23.57% near Zhangye City to 60.28% near Gaotai City, and then
a dramatic drop to 13.61% near Zhengyixia Station because of agricultural flood irrigation in Zhangye Basin. |
| |
Keywords: | Heihe River Precipitation Isotope Runoff |
本文献已被 SpringerLink 等数据库收录! |
|