气候变化领域集成服务门户(CCPortal): Application of an improved distributed hydrological model based on the soil-gravel structure in the Niyang River basin, Qinghai-Tibet Plateau

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DOI	10.5194/hess-27-2681-2023
	Application of an improved distributed hydrological model based on the soil-gravel structure in the Niyang River basin, Qinghai-Tibet Plateau
	Wang, Pengxiang; Zhou, Zuhao; Liu, Jiajia; Xu, Chongyu; Wang, Kang; Liu, Yangli; Li, Jia; Li, Yuqing; Jia, Yangwen; Wang, Hao
发表日期	2023
ISSN	1027-5606
EISSN	1607-7938
起始页码	2681
结束页码	2701
卷号	27 期号:14
英文摘要	Runoff formation and hydrologic regulation mechanisms in mountainous cold regions are the basis for investigating the response patterns of hydrological processes under climate change. Because of plate movements and climatic effects, the surface soils of bare lands and grasslands on the Qinghai-Tibet Plateau (QTP) are thin, and the soil below the surface contains abundant gravel. This characteristic geological structure, combined with snow and frozen soil, affects the water cycle in this region. To investigate the influence of the underlying surface structure on water-heat transport and water circulation processes on the QTP, a comprehensive study was performed combining water-heat transfer field experiments, and a water and energy transfer process model for the QTP (WEP-QTP) was developed based on the original water and energy transfer process model in cold regions (WEP-COR). The Niyang River basin, located on the QTP, was selected as the study area to evaluate the consistency between theoretical hypotheses, observations, and modeling results. The model divided the uniform soil profile into a dualistic soil-gravel structure. When no phase change was present in the ground, two infiltration models based on the dualistic soil-gravel structure were developed; these used the Richards equation to model a non-heavy rain scenario and the multilayer Green-Ampt model for a heavy rain scenario. During the freeze-thaw period, a water-heat coupling model based on the snow-soil-gravel layer structure was constructed. By considering gravel, the improved model corrected the overestimation of the moisture content below the surface soil predicted by the original model and reduced the moisture content relative error (RE) from 33.74% to 12.11 %. The addition of the snow layer not only reduced the temperature fluctuation of the surface soil, but also revised the overestimation of the freeze-thaw speed predicted by the original model with the help of the gravel. The temperature root-mean-square error was reduced from 1.16 to 0.86 ffiC. In the fully thawed period, the dualistic soilgravel structure improved the regulation effect of groundwater on flow, thus stabilizing the flow process. The maximum RE at the flow peak and trough decreased by 88.2% and 21.3 %, respectively. In the freeze-thaw period, by considering the effect of the snow-soil-gravel layer structure, the freezing and thawing processes of WEP-QTP lagged behind those of WEP-COR by approximately 1 month. The groundwater simulated by WEP-QTP had more time to recharge the river, which better represented the observed tailing process from September onwards. The flow simulated by the WEP-QTP model was more accurate and closer to the actual measurements, with Nash-Sutcliffe efficiency > 0.75 and \|RE\| < 10 %. The improved model reflects the effects of the typical QTP environment on water-heat transport and water cycling and can thus be used for hydrological simulation on the QTP.
英文关键词	FROZEN SOIL; WATER INFILTRATION; REGIONAL CLIMATE; ROCK FRAGMENTS; PARAMETERIZATION; TEMPERATURE; RUNOFF; COLD; WEST
WOS研究方向	Geosciences, Multidisciplinary ; Water Resources
WOS记录号	WOS:001031785400001
来源期刊	HYDROLOGY AND EARTH SYSTEM SCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283325
作者单位	China Institute of Water Resources & Hydropower Research; China Three Gorges Corporation; Wuhan University; Ministry of Water Resources; China Institute of Water Resources & Hydropower Research; Tibet Agriculture & Animal Husbandry University; University of Oslo
推荐引用方式 GB/T 7714	Wang, Pengxiang,Zhou, Zuhao,Liu, Jiajia,et al. Application of an improved distributed hydrological model based on the soil-gravel structure in the Niyang River basin, Qinghai-Tibet Plateau[J],2023,27(14).
APA	Wang, Pengxiang.,Zhou, Zuhao.,Liu, Jiajia.,Xu, Chongyu.,Wang, Kang.,...&Wang, Hao.(2023).Application of an improved distributed hydrological model based on the soil-gravel structure in the Niyang River basin, Qinghai-Tibet Plateau.HYDROLOGY AND EARTH SYSTEM SCIENCES,27(14).
MLA	Wang, Pengxiang,et al."Application of an improved distributed hydrological model based on the soil-gravel structure in the Niyang River basin, Qinghai-Tibet Plateau".HYDROLOGY AND EARTH SYSTEM SCIENCES 27.14(2023).