Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for obtaining water age of Qinghai-Tibet Plateau river

A water age and river technology, applied in the field of obtaining the water age of rivers in the Qinghai-Tibet Plateau, can solve the problems of difficult sampling and rare long-sequence isotope analysis

Pending Publication Date: 2021-06-08
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, long-sequence isotope analyzes are rare due to sampling difficulties in the Tibetan Plateau, especially in high-altitude permafrost regions

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for obtaining water age of Qinghai-Tibet Plateau river
  • Method for obtaining water age of Qinghai-Tibet Plateau river
  • Method for obtaining water age of Qinghai-Tibet Plateau river

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1. Content / proportion of water less than specified age in runoff

[0037] δD and δ 18 O conforms to a sinusoidal fluctuation of period t (eg, 365 days). For various types of research objects (rivers, slopes, lakes, ponds, etc.), the water source regeneration cycle is affected by water demand and variation. For a watershed, the tracer concentration time series for precipitation and runoff follow the relationship:

[0038]

[0039] In the formula, C r (t) is the tracer concentration in runoff at time t; C p(t-τ) is the tracer concentration in the precipitation at time t-τ, and h(τ) is the distribution function of tracer retention time.

[0040] First, the following formula is fitted with a sine function to obtain the rainfall C p (t) and runoff C r (t) Time series curve of tracer concentration:

[0041] C p (t)=ap cos(2πft)+b p sin(2πft)+k p

[0042] C r (t) = α r cos(2πft)+b r sin(2πft)+k r

[0043] In the formula, f is the cycle frequency (1 / ...

Embodiment 2

[0054] Example 2. Content / proportion of water in runoff between specified ages

[0055] f yw Used to quantify young water in a catchment; however, the proportion of old water is unclear. The time of precipitation flowing into the outlet of the basin can be divided into short-term, medium-term and long-term, and the corresponding flows are called young water, middle-aged water and old water. . Middle-aged water means greater than τ yw , but less than a certain time threshold τ ow (eg, 1 year) of water. This water usually becomes seasonally frozen ground and groundwater, which then flows into outlets. Old age water means greater than a certain time threshold τ ow This part of the water, the old age water, usually becomes permafrost, glaciers, permanent snow and glaciers. Glaciers, permafrost, deep groundwater and other old water can regulate water resources for many years. During the warming period, old-age water can replenish the reduced river runoff in the Qinghai-Tibe...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for obtaining the water age of a Qinghai-Tibet Plateau river, and the method comprises the steps: carrying out the model construction based on a stable isotope tracer agent, obtaining the average time needed by the tracer agent to reach an outlet after the tracer agent enters a drainage basin, and displaying the water circulation rate and the runoff water age of the river; and respectively calculating the following two indexes: A, the content / proportion of water of which the age is smaller than the specified age in the runoff and B, the content / proportion of water of which the age is smaller than the specified age in the runoff, thereby measuring or displaying the water age of the river. The multi-index water age obtaining method suitable for the Qinghai-Tibet Plateau has important practical significance in knowing the influence of water circulation and climate change on glacier, permafrost and other water bodies.

Description

technical field [0001] The invention relates to the technical field of hydrogeography, in particular to a method for obtaining the age of rivers on the Qinghai-Tibet Plateau. Background technique [0002] Runoff age, the average time it takes for a set of tracers to reach the outlet after entering a watershed, is a key indicator of the rate of water circulation. Stable Hydrogen (D) Oxygen ( 18 O) isotopes are isotopes that occur naturally in water bodies. They are the most common water tracers and are an important means of studying water characteristics and age. Water bodies from different sources have different isotopic composition characteristics, which are mainly reflected in the distribution of precipitation isotopes, evaporation intensity, and water body transit time in the basin. 6D and 6 in runoff 18 The spatio-temporal variation of O is affected by watershed topography and human activities, 6D and 6 18 The isotopic signature of O describes the source profile of ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 严登华杨裕恒翁白莎李蒙于志磊牛永振宫晓艳
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES