Article
Engineering, Civil
Weiming Kang, Jie Tian, Yao Lai, Shaoyuan Xu, Chao Gao, Weijie Hong, Yongxu Zhou, Lina Pei, Chansheng He
Summary: Preferential flow (PF) is an important process affecting hydrological, geochemical, and ecological cycles. However, the factors that control PF in data-scarce high and cold mountainous areas are not fully understood. This study analyzed the occurrence and spatial-temporal control of PF in a cold, mountainous environment using soil moisture observations in the upper reaches of the Heihe River Basin, Northwest China. The results show that vegetation, soil properties, and water conditions jointly affect the occurrence of PF, and the influence of initial soil moisture on PF varies across different sand content.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
Pamela A. Melo, Livia A. Alvarenga, Javier Tomasella, Carlos R. de Mello, Minella A. Martins, Gilberto Coelho
Summary: This study quantified the hydrological impacts of climate and anthropogenic changes in the Upper Grande River Basin and predicted potential future impacts on runoff based on climate model projections. The results showed that both climate and land-use changes have significant influences on the hydrological regime, with the expansion of agricultural areas being the main driver of anthropogenic impacts. Future climate projections indicate a reduction in average runoff, and the Budyko framework performed well in predicting future climate change impacts on water availability, similar to previous hydrological modeling studies in the same region.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Geography, Physical
Ning Nie, Wanchang Zhang, Min Liu, Hao Chen, Dengzhong Zhao
Summary: The study reveals that climate variability has the most significant impact on outflow changes in most sub-basins, while reservoir operations and land-use changes also influence seasonal streamflow variations to varying degrees. The findings of this research are crucial for decision-making in regional water resources planning and management.
INTERNATIONAL JOURNAL OF DIGITAL EARTH
(2021)
Article
Environmental Sciences
Shakthi K. Gunawardana, Sangam Shrestha, S. Mohanasundaram, Krishna R. Salin, Thanapon Piman
Summary: Human-induced changes in land and water resources have a negative impact on global hydrological conditions, especially damaging river ecosystems and livelihoods. Analyzing the effects of changes in land use, climate, and hydropower development on the hydrological regime can aid in more efficient water resources management.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Yuwei Wang, Na Zhao
Summary: This study comprehensively evaluates the accuracy of eight high-resolution gridded precipitation products in the Heihe River basin (HRB). The results show variations in accuracy among different products at different temporal and spatial scales. MSWEP shows the highest accuracy at an annual scale, while PERSIANN, CRU, and ERA5 provide the most accurate results in different reaches of the HRB.
Article
Environmental Sciences
Qianxi Shen, Jun Niu, Bellie Sivakumar, Na Lu
Summary: Plastic film mulching is an effective method for managing agricultural fields in water shortage areas, as it can save water and increase crop yield. This study used remote sensing data and modeling to analyze the effects of plastic film mulching on maize yield and evapotranspiration in the Heihe River basin in Northwest China. The results showed that plastic film mulching increased maize yield in certain areas and reduced evapotranspiration in planted areas.
Article
Environmental Sciences
Tao Yu, Qiang Zhang, Rui Sun
Summary: Studying the spatial representativeness of carbon flux measurement data for typical land cover types in the Heihe River Basin, China, revealed climate footprint distances ranging from about 500 m to 1500 m. Validating multiple-scale GPP products at footprint scale showed higher accuracy compared to field scale, indicating that precision may be higher when validating remote sensing GPP products at the footprint scale.
Article
Water Resources
Xinfeng Fan, Lei Wang, Xiuping Li, Jing Zhou, Deliang Chen, Hanbo Yang
Summary: The study focuses on the impact of high-altitude headwaters on the water supply and discharge variations in the Yellow River Basin. The results show that more than one-third of the water flow from the headwaters is used downstream for irrigation. The observed discharge increased by 44.07% in the YRB after the year 2002, with 76.45% of the increase coming from the headwaters. Increased precipitation in the headwaters contributed to the overall discharge recovery, while variations in evapotranspiration, land cover, and water use decreased the discharge.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2022)
Article
Environmental Sciences
Tengfei Yu, Qi Feng, Jianhua Si, Haiyang Xi, Yonghong Su, Patrick J. Mitchell, Elizabeth A. Pinkard
Summary: The study focused on the effects of flooding on water use in riparian forests in arid regions, specifically on root water uptake and tree growth. Results showed that flooding had varying impacts on transpiration across different years, suggesting the need for longer time series to confirm conclusions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Green & Sustainable Science & Technology
Guanghui Yuan, Yu Zhang, Erchen Li, Yubao Liu
Summary: The study compares the micrometeorological elements, radiation budget, and surface energy distribution of four sites with different land cover types in the Heihe River basin. It aims to investigate the differences in land-atmosphere interaction and the biophysical effects of land use and cover change on surface temperature. The desert site exhibits the highest soil surface temperature, while the non-desert sites show cooling effects during daytime. The differences in cooling effects are attributed to various factors, such as albedo, radiation, and heat flux.
Article
Agronomy
Qi Liu, Jun Niu, Jeffrey D. Wood, Shaozhong Kang
Summary: This study investigates optimizing the regional cropping distribution in the Heihe River basin in order to improve crop water productivity and reduce irrigation water demand. The results show that maximizing crop water productivity, economic water productivity, and nutrient water productivity can lead to a decrease in the planting area of corn and wheat and an increase in the planting proportion of barley and canola. This reduces irrigation water demand and improves water productivity in the basin.
AGRICULTURAL WATER MANAGEMENT
(2022)
Article
Biodiversity Conservation
Jing Zhao, Zhuang Shao, Chuyu Xia, Kai Fang, Ran Chen, Jun Zhou
Summary: This study used the InVEST and FLUS models to examine the impacts of land use and land cover changes on key ecosystem services in the Heihe River Basin. The results showed that future changes in carbon storage and water yield may vary, while soil conservation is expected to decrease significantly. This research provides valuable insights for sustainable ecological environment zoning management.
ECOLOGICAL INDICATORS
(2022)
Article
Meteorology & Atmospheric Sciences
Didi Hu, Min Xu, Shichang Kang, Hao Wu
Summary: This study examines the changes in climate and discharge in the Ob River Basin in the Arctic region and finds increasing trends for variables such as temperature, precipitation, evapotranspiration, and runoff. The study also discusses the contributions of climate change and human activities to these runoff changes. The findings are significant for water resource management in the Arctic.
THEORETICAL AND APPLIED CLIMATOLOGY
(2022)
Article
Agronomy
Wenjuan Cai, Xiaohui Jiang, Haotian Sun, Yuxin Lei, Tong Nie, Lichan Li
Summary: A judgment method was developed to detect the occurrence of the irrigation efficiency paradox (IEP) in the middle Heihe River Basin. The study found that the scale effects of the IEP can vary depending on the evaluation parameters and regional characteristics. The results can be useful for implementing water-saving measures in arid regions.
AGRICULTURAL WATER MANAGEMENT
(2023)
Article
Environmental Sciences
Demelash Ademe Malede, Tena Alamirew, Tesfa Gebrie Andualem
Summary: This study investigates the impacts of land use/land cover (LULC) and climate change on the hydrological processes of the Birr River watershed. The results show that changes in LULC have increased surface runoff and decreased baseflow, water yield, and evapotranspiration. Climate change has also increased surface runoff and water yield, while decreasing baseflow and evapotranspiration. These findings are important for authorities, water engineers, and managers concerned with hydrology, LULC, and climate.
Article
Engineering, Civil
Ling Zhang, Dong Ren, Zhuotong Nan, Weizhen Wang, Yi Zhao, Yanbo Zhao, Qimin Ma, Xiaobo Wu
JOURNAL OF HYDROLOGY
(2020)
Article
Geography, Physical
Jianan Hu, Shuping Zhao, Zhuotong Nan, Xiaobo Wu, Xuehui Sun, Guodong Cheng
PERMAFROST AND PERIGLACIAL PROCESSES
(2020)
Article
Environmental Sciences
Zetao Cao, Hongxia Gao, Zhuotong Nan, Yi Zhao, Ziyun Yin
Summary: A semi-physical approach was applied to downscale satellite soil moisture data in cold alpine areas, leading to good agreement with in-situ observations. The fine-resolution data obtained from this method can be useful for land surface and hydrological studies in such areas.
Article
Geochemistry & Geophysics
Guofei Zhang, Zhuotong Nan, Lin Zhao, Yijia Liang, Guodong Cheng
Summary: Permafrost in the Qinghai-Tibet Plateau has experienced significant warming and wetting recently, impacting thermal dynamics. Climate wetting reduces permafrost responses to warming, especially in arid and semi-arid zones. Increased summer precipitation has dual effects on permafrost in semi-arid high altitudes.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Environmental Sciences
Ziyun Yin, Zhuotong Nan, Zetao Cao, Guofei Zhang
Summary: In the study, the applicability and limitations of the adjustment method for global climate simulation results were evaluated through observations at 36 sites on the Qinghai-Tibetan Plateau, providing insight into the method's performance in adjusting meteorological variables.
Article
Meteorology & Atmospheric Sciences
Guofei Zhang, Zhuotong Nan, Ziyun Yin, Lin Zhao
Summary: Research shows that the thermal regime of permafrost is highly sensitive to winter temperature changes, particularly in the Three River Source region and Qiangtang High Plateau where significant degradation has been observed in the 2000s. Each degree of rising in air temperature in summer leads to an increase in active layer thickness and mean annual ground temperature, but the overall impact of winter warming exceeding that of summer warming due to a triple warming rate in winter during this period.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Geosciences, Multidisciplinary
Jianan Hu, Zhuotong Nan, Hailong Ji
Summary: Permafrost degradation caused by climate warming can disturb alpine ecosystem stability and influence net primary productivity (NPP). In this study, the changes in NPP in the Three-River Headwaters Region (TRHR) on the Qinghai-Tibet plateau were simulated using the Noah-MP model. The results showed that NPP in TRHR increased slightly during 1989-2018 but decreased in recent years. Permafrost degradation has complex implications for ecosystem, with both increasing and decreasing changes in NPP observed.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Meteorology & Atmospheric Sciences
Hailong Ji, Zhuotong Nan, Jianan Hu, Yi Zhao, Yaonan Zhang
Summary: This study evaluated the impacts of different spin-up strategies on permafrost modeling on the Qinghai-Tibet Plateau. The results showed that the choice of spin-up length and cycling scheme significantly influenced the convergence of the model and the degradation rates. A spin-up strategy of a 500-year cycling with the first 5-10-year of forcing was recommended for modeling permafrost on the QTP.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Environmental Sciences
Guofei Zhang, Zhuotong Nan, Na Hu, Ziyun Yin, Lin Zhao, Guodong Cheng, Cuicui Mu
Summary: Global warming is causing permafrost degradation on the Qinghai-Tibet Plateau, with projections showing significant loss of permafrost and changes in thermal regimes. The analysis indicates that the alpine permafrost on the plateau has low resilience to climate change.
Article
Environmental Sciences
Guofei Zhang, Cuicui Mu, Zhuotong Nan, Xiaodong Wu, Guodong Cheng
Summary: Global warming leads to widespread degradation of permafrost, the geographic regularity of which is unknown. This study investigates the three-dimensional features of future permafrost degradation on the Qinghai-Tibetan Plateau. The findings show that permafrost degradation under shared socioeconomic pathways (SSPs) exhibits distinct three-dimensional characteristics. Elevation-dependent degradation, meaning slower degradation at higher elevations, is closely linked to thermal conditions that vary with elevation.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Yi Zhao, Zhuotong Nan, Zetao Cao, Hailong Ji, Jianan Hu
Summary: Soil matric potential is a crucial variable in land surface models and is greatly influenced by soil ice in frozen ground. This study evaluated four parameterization schemes of soil matric potential that incorporated different effects of soil pore ice. The scheme that considered both effects performed the best, accurately simulating soil moisture content and temperature. The schemes that considered only one effect showed limitations, with one underestimating unfrozen water content and the other overestimating it, leading to discrepancies in simulated soil temperature. The scheme that ignored both effects performed better than the partially considered schemes, but not as well as the scheme that considered both effects.
WATER RESOURCES RESEARCH
(2023)
Article
Environmental Sciences
Yixin Sun, Zhuotong Nan, Wendong Yang, Longhui Li
Summary: Future changes in climate and socioeconomic systems will increase water scarcity in China. Using an integrated assessment model and a global hydrological model, this study projects China's future water footprints and scarcity by considering both climate change and socioeconomic factors. The results suggest that China's water footprints are likely to peak around 2030 and then decrease.
Article
Geography, Physical
Yi Zhao, Zhuotong Nan, Hailong Ji, Lin Zhao
Summary: Convective heat transfer (CHT) is an important process in permafrost areas, but it is often ignored in permafrost studies. This study applied the Simultaneous Heat and Water (SHAW) model to investigate the impacts of CHT on the thermal dynamics of the active layer in a permafrost site on the Qinghai-Tibet Plateau. The results showed that CHT mainly occurred during thaw periods in shallow and intermediate soil depths, with greater impacts on shallow soil temperatures during spring melting periods.
Article
Engineering, Electrical & Electronic
Yuhong Chen, Zhuotong Nan, Shuping Zhao, Yi Xu
Summary: This study addresses weaknesses in the Yu method of clear-sky interpolation for MODIS land surface temperature products and proposes a novel approach that utilizes multiple temporally proximate images to improve accuracy. By comparing the proposed approach with established methods such as harmonic analysis of time series and co-kriging through two experiments, it was demonstrated that the proposed approach outperforms these methods with higher spatial correlation coefficients (0.90-0.94) and lower root-mean-square errors (1.19-3.64 degrees C) when measured against intentionally removed original data.
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
(2021)
Article
Geosciences, Multidisciplinary
Youhua Ran, Xin Li, Guodong Cheng, Zhuotong Nan, Jinxing Che, Yu Sheng, Qingbai Wu, Huijun Jin, Dongliang Luo, Zhiguang Tang, Xiaobo Wu
Summary: This study produced a new permafrost stability distribution map for the Tibetan Plateau in the 2010s, integrating various data sources and employing an ensemble learning method. Validation results suggest it is the most accurate map currently available. The map is crucial for engineering planning, ecosystem management, and assessing future permafrost changes on the Tibetan Plateau.
SCIENCE CHINA-EARTH SCIENCES
(2021)