干旱区研究

Arid Zone Research >

2023 , Vol. 40 >Issue 9: 1438 - 1445

DOI: https://doi.org/10.13866/j.azr.2023.09.07

Land and Water Resources

Monitoring of Hulun Lake water level changes based on ICESat-2 satellite altimetry data

  • Junyan LIU ,
  • Shijie WANG
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  • 1. Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China
    2. Nation-local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring, Lanzhou 730070, Gansu, China
    3. Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou 730070, Gansu, China
    4. Academician Expert Workstation of Gansu Dayu Jiuzhou Space Information Technology Co., Ltd., Lanzhou 730050, Gansu, China

Received date: 2023-02-28

  Revised date: 2023-04-13

  Online published: 2023-09-28

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Abstract

The water level changes of grassland lakes indicate the changes of grassland ecological environment, which is an important indicator of grassland ecological changes. We use the ATL13 global inland water data of ICESat-2 satellite from November 2018 to January 2022 to construct a high-precision water level change sequence of Hulun Lake. The results are verified using DAHITI, Hydroweb, and G-REALM water level data. Based on the relationship between lake area and water level change, a water level area relationship model is constructed to analyze the seasonal characteristics of lake water level changes and the influence of external factors on lake water level. The research results showed that: from November 2018 to January 2022, the water level of Hulun Lake showed an overall upward trend, with an average annual water level rise rate of 0.49 m·a-1. The water level of the lake decreases from March to June each year, rises from July to October, and stabilizes from November to February of the following year. It is known from the comparison and verification with DAHITI, Hydroweb, and G-REALM water level data that the ICESat-2 satellite monitoring water level data is stable, the water level sequence precision is high, and the root mean square error is 9.7 cm, which is reliable. The Combination of the ICESat-2 satellite water level monitoring results and the lake water level area model can achieve multi-time and high-precision lake water level monitoring, and calculate the time series of water level seasonal changes, which showed that the seasonal characteristics of Hulun Lake water level are obvious, and the inter annual trend is basically stable. The water level decreases from spring to summer and rises from summer to winter. The changes of lake water level is greatly affected by external factors. The increase of evaporation caused by the rise of temperature is the main factor leading to the decrease of lake water level. The temperature, evaporation, and water level change showed a strong negative correlation. The recharge of the lake water volume by artificial water injection has increased the lake level and the trend of increasing water level is obvious during the injection period in 2021.

Key words： ICESat-2; satellite altimetry; water level monitoring; influencing factors; Hulun Lake

Cite this article

Junyan LIU , Shijie WANG . Monitoring of Hulun Lake water level changes based on ICESat-2 satellite altimetry data[J]. Arid Zone Research, 2023 , 40(9) : 1438 -1445 . DOI: 10.13866/j.azr.2023.09.07

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