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| DOI：10.13522/j.cnki.ggps.2020698 |
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| Spatiotemporal Variation in Water Yield and Their Underlying Mechanisms in Tarim River Basin |
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SUN Qi, XU Changchun, REN Zhengliang, CHU Zhi
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1.College of Resource and Environment Sciences, Xinjiang University, Urumqi 830046, China;
2. MOE Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi 830046, China
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| Abstract: |
| 【Objective】Global climate change and anthropogenic activities combine to have altered water flow and distribution in many basins, especially those in arid and semi-arid regions. Understanding water yield and its spatiotemporal change in a basin, as well as their determinants, is hence important to improve water management but challenging because of the amount of data it requires. Taking Tarim basin as an example, this paper aims to analyze the spatiotemporal changes in its water yield and the underlying mechanisms.【Method】The analysis was based on numerical simulations; spatiotemporal distribution of water yield from 2000 to 2015 in three catchments in the basin: Hotan catchment, Kaidu-Kongqu catchment, and Yerqiang catchment, was simulated using the InVEST model. Factors posited to impact water yield in the three catchments, including precipitation, temperature, solar radiation, wind speed, relative humidity, GDP and population density, were analyzed using the Pearson correlation and the geographic detector.【Result】Spatially, the average annual water yield in each catchment was in its upper reach with average depth of the water yield in all three catchments being more than 30 mm. On average, the water yield in Kaidu-Kongque catchment was more than that in the Hetian and Yarkant catchment; and the water yield in most upstream areas in the three catchments was more than 120 mm. From 2000 to 2015, the water yield in Hetian and Kaidu-Kongque catchment had been in decline, while that in Yarkant catchment had been in rise. Precipitation and water production were correlated at significant level for all studied areas, accounting for 73.99%, 88.49% and 71.11% of the water production in Hetian, Kaidu-Peacock and Yarkant catchments respectively, indicating that precipitation was the key contributor to the water yield. Geographical-detector analysis revealed that air temperature and precipitation were the dominant factors controlling the spatial distribution of water yield and their impacts were nonlinearly integrated, with the Q value being higher than 0.438. Intra-basin factors that were not correlated at significant level are as follows: Population density and GDP for Hetian catchment; relative humidity, radiation and wind speed for Kaidu-Kongque catchment; population density and humidity for Yarkant catchment.【Conclusion】The water yield in typical inland river basins in arid areas of northwestern China was mainly affected by temperature and precipitation. |
| Key words: arid regions of Northwestern China; water production; spatiotemporal distribution; climatic factors; socioeconomic factors |
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