Xiaohong Chen

Xiaohong Chen
Sun Yat-Sen University | SYSU · Center for Water Resources and Environment

PhD

About

271
Publications
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6,228
Citations

Publications

Publications (271)
Article
Full-text available
Compound climate events can strongly impact vegetation productivity, yet the direct and lagged vegetation productivity responses to seasonal compound warm-dry and cold-dry events remain unclear. Here we use observationally-constrained and process-based model data and analyze vegetation productivity responses to compound events of precipitation and...
Preprint
Satellite-based Normalized Difference Vegetation Index (NDVI) time-series data are useful for monitoring the changes of vegetation ecosystems in the context of global climate change. However, there are currently no ideal NDVI datasets that reconcile long-term series with high spatial resolution. Here, we have developed a simple and novel data downs...
Article
Full-text available
Runoff prediction plays an important guiding role in water resources planning and management, flood and drought prevention. As the Hanjiang River Basin (HRB) is the water source of the middle line of the South-to-North Water Diversion Project, it has higher requirements for water resources accurate prediction. In order to analyze the prediction cap...
Article
Subseasonal to seasonal (S2S) precipitation forecasts can fill the gap between weather and seasonal forecasts. While raw forecasts from S2S models are informative, calibration is necessary to correct systematic biases and quantify forecast uncertainty to facilitate applications of S2S forecasts. This paper develops a seven-parameter Bernoulli-Gamma...
Article
While global streamflow reanalysis provides valuable information for environmental modelling and management, it is not yet known how effective they are in characterizing the local flow regime. This paper presents a novel evaluation of the potential of streamflow reanalysis in the flow regime analysis by accounting for the effects of reservoir opera...
Article
The PairwiseIHA is an open-source toolkit written in Python that enables the user to quickly obtain the Indicators of Hydrologic Alteration (IHA) from inflow and outflow time series for headwater reservoirs. Specifically, the IHA metrics obtained from inflows (outflows) are considered as natural (regulated) and the differences are used to indicate...
Preprint
Heavy metals input from the coastal urbanization and industrialization and the potential ecological risks have been a great concern in the northern South China Sea (NSCS). Our results showed that the NSCS surface sediments are characterized by sand, silt and sandy silt. CaO and Sr were fixed in the fine-grained biogenic calcareous debris. Sc, V, Cr...
Article
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Socioeconomic drought occurs when a water shortage is caused by an imbalance between the supply and demand of water resources in natural and human socioeconomic systems. Compared with meteorological drought, hydrological drought, and agricultural drought, socioeconomic drought has received relatively little attention. Hence, this study aims to cons...
Article
The Qinghai-Tibet Plateau (TP) is one of the most sensitive areas to climate change, and its ecological environment changes directly or indirectly reflect the global climate change trend. The snow cover ratio (SCR) is one of the important indicators reflecting the climate and environmental changes on the TP. The daily remote sensing data of snow co...
Article
The Jinsha River comprises the upper reaches of the Yangtze River, which is the river section with the highest sediment content. Monitoring of sediment transport in the Jinsha River is done to the guarantee for the normal operation of the Three Gorges Reservoir. In the current study, a copula function was used to do a joint probability analysis of...
Article
Full-text available
(Free access before May 25, 2022: https://authors.elsevier.com/a/1escN7qzSxbUa) The accurate spatial information of snow cover is useful for understanding the impact of global warming, and it is of high significance for hydrological disaster prediction, water resources management, and climate change research. The Normalized Difference Snow Index (N...
Article
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Precipitation in China is controlled by a combination of multiple weather systems and is susceptible to their spatio-temporal variability under climate warming. Based on the daily precipitation dataset developed by the China Meteorological Administration and ERA5 6-hourly reanalysis data ranging from 1979-2018, we detected tropical cyclones, extrat...
Article
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Drought imposes serious challenges to ecosystems and societies and has plagued mankind throughout the ages. To understand the long-term trend of drought in China, a series of annual self-calibrating Palmer drought severity indexes (scPDSI), which is a semi-physical drought index based on the land surface water balance, were reconstructed during AD...
Article
With small cascade hydropower projects (SCHPs) increasingly employed in small and medium rivers, methods to assess changes in health status within the stream system have become essential to river ecological environment management. In this study, we used a cloud based fuzzy evaluation method to synthetically diagnose the health status of a stream, b...
Article
Water resources are distributed in the form of virtual water through international trade, which influences the water supply and consumption of each country. Therefore, it is of significance to study the driving factors of grain virtual water trade to alleviate water stress and guarantee food security. In this paper, the virtual water volume of grai...
Preprint
While El Niño–Southern Oscillation (ENSO) teleconnection has long been used in statistical hydroclimatic forecasting, global climate models (GCMs) provide increasingly available dynamical precipitation forecasts for hydrological modelling and water resources management. It is not yet known to what extent dynamical GCM forecasts provide new informat...
Article
Along with climate change, drought has been known to be a catastrophic and complicated natural calamity that severely influences society and individual lives. Among various types of droughts, a socioeconomic drought is defined when a watershed is not capable of meeting water demands, resulting in water shortage. Although meteorological, hydrologica...
Article
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Understanding dissolved oxygen (DO) dynamics and corresponding driving factors are essential to improve aquatic environments and protect aquatic organisms. Although several studies have been conducted to investigate DO dynamics on low-frequency scales, high-frequency spectral characteristics of DO and the corresponding connections with hydro-biogeo...
Article
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Understanding the influence factors of hydrological drought internal propagation (HDIP) is crucial for early detection of hydrological drought. However, the ‘false recovery’ (FR) during development of hydrological drought and ‘false intensification’ (FI) during the recovery stage were not considered. Here, the definitions of FR and FI were firstly...
Article
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Precipitation forecasts generated by global climate models (GCMs) are valuable for environmental modelling and management. At the seasonal timescale, GCMs’ forecast skills are generally attributed to low-frequency climate signals, particularly to the internal climate variability mode of El Niño-Southern Oscillation (ENSO). This study proposes a dia...
Article
The excessive application of agricultural irrigation water and chemical fertilizer has increased crop yields to help meet the demand for food, but it has also led to major water environment problem, i.e. non-point source (NPS) pollution, which needs to be addressed to achieve sustainable development targets. Although numerous studies have focused o...
Article
The projection of reference crop evapotranspiration (ETo) based on global climate models (GCMs) is an important task in many fields under climate change background. However, ETo projections are typically hindered by the limited data availability or high uncertainty of the GCM-projected climate variable for ETo calculation (e.g., radiation and wind...
Article
In recent years, under the background of global warming, influenced by changing climate conditions and human activities, the sea level time series have shown great non-stationarity and randomness, making it difficult to predict sea levels scientifically and accurately. Sea level simulations and predictions under climate change are hot topics in glo...
Article
Gridded precipitation products are efficient supplements to surface meteorological gauges and thus a comprehensive evaluation of such products is essential. This study systematically evaluated the performance of 4 gridded precipitation datasets with hourly scale in mainland China, with ground gauge precipitation as a benchmark. In particular, we as...
Preprint
Full-text available
The relationship between sea level change and a single climate indicator has been widely discussed. Despite this, few studies focused on the relationship between monthly mean sea level (MMSL) and several key impact factors, including CO 2 concentration, sea ice area, and sunspots, on various time scales. In addition, research on the independent rel...
Article
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The Hanjiang River is the source of water for the Middle Route of the South-to-North Water Diversion Project. So a reasonable evaluation on water resources future changes in the Hanjiang River Basin (HRB) is essential to ensure its water safety. In this study, we firstly evaluated the China meteorological forcing dataset (CMFD), and then used it to...
Article
Regulation of streamflow by large reservoirs alters the characteristics of hydrological drought. However, few studies have focused on the impacts of regulation on the water required (WR) for hydrological drought recovery, nor on the response relationship between WR and drought characteristics (i.e., duration and severity). Therefore, we proposed a...
Article
Compared with a single drought event, compound drought (i.e., two or more droughts occurring simultaneously) has more substantial effects on economic growth, water resources, and the ecological environment. A useful framework for assessing compound drought events from a drought propagation perspective was proposed. The framework includes the defini...
Preprint
Full-text available
Socioeconomic drought is a phenomenon of water shortage caused by an imbalance between the supply and demand of water resources in natural and human socioeconomic systems. Occurrence of these droughts is closely related to sustainable socioeconomic development. However, compared with meteorological drought, hydrological drought and agricultural dro...
Article
Land use management of forests and croplands mainly drives the vegetation greening in China. Vegetation greening strongly modulates the trade-off between carbon sequestration via photosynthesis and water loss from evapotranspiration (ET) at the terrestrial ecosystem (representing by ecosystem water use efficiency, WUE). The function of vegetation g...
Article
Accurate prediction of dissolved oxygen time series is important for improving the water environment and aiding water resource management. In this study, four stand-alone models including multiple linear regression (MLR), support vector machine (SVM), artificial neural network (ANN) and random forest (RF), and four hybrid models based on wavelet tr...
Article
Affected by climate change and human activities, the frequency and uncertainty of extreme precipitation have shown an increasing trend, which has brought great challenges to the prevention of flood disasters. The Huaihe River Basin (HRB) is located at the junction of northern and southern China and is more susceptible to climate change. In order to...
Article
Normalized Difference Vegetation Index (NDVI) is an important indicator reflecting the state of regional climate and environment, which is affected by precipitation, temperature, soil water content, and so on. This study analyzed the influence of different factors on NDVI through the spearman correlation coefficient (SCC) and standard regression co...
Article
Calibration is necessary for improving raw forecasts generated by global climate models (GCMs) to fully utilize potential benefits of the forecasts in practical applications. Based on quantile mapping (QM), this paper proposes a five-parameter Gamma-Gaussian model to calibrate monthly and seasonal GCM precipitation forecasts. While QM directly maps...
Article
In recent years, due to the influence of human activities and changing climate conditions, precipitation time series have had increasing non-stationarity and randomness. Therefore, the scientific and accurate prediction of precipitation has become increasingly difficult. To improve precipitation prediction accuracy, nonlinear precipitation data was...
Article
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Vegetation interacts closely with water resources. Conventional field studies of plant–water relations are fundamental for understanding the mechanisms of how plants alter and adapt to environmental changes, while large-scale studies can be more practical for regional land use and water management towards mitigating climate change impacts. In this...
Article
Extreme low and high precipitation can cause natural disasters (e.g., drought and flood events) which have devastating effects on natural environment and the human society. In this study, we present a framework for assessing the stability of spatial dependence of extreme precipitation and their concurrence probability in a nested catchment. The Pea...
Article
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While reliable drought prediction is fundamental for drought mitigation and water resources management, it is still a challenge to develop robust drought prediction models due to complex local hydro-climatic conditions and various predictors. Sea surface temperature (SST) is considered as the fundamental predictor to develop drought prediction mode...
Article
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This study investigated the strength and limitations of two widely used multi-model averaging frameworks—Bayesian model averaging (BMA) and reliability ensemble averaging (REA), in post-processing runoff projections derived from coupled hydrological models and climate downscaling models. The performance and weight distributions of five model ensemb...
Article
The Lancang River (Upper Mekong), originated from Qinghai-Tibet Plateau, is the main water source for Southeast Asia countries. In recent years, people have paid more and more attention to the impact of climate change and human activities on the Lancang River water resources system. Due to external disturbances, the vulnerability of water resources...
Article
Precipitation in China has a sharply uneven spatial-temporal distribution, which has caused serious droughts and heavy floods in China. Using statistic and K-means clustering methods, this study systematically assessed the distribution characteristics of precipitation in China from four aspects, including the spatial-temporal distribution of precip...
Article
Hydropower plant operation alters natural streamflow regimes, which leads to tradeoff between hydropower benefits and the needs of downstream river ecosystems. This study proposes a novel approach for evaluating how hydropower-ecology tradeoff will evolve under future climate change based on Pareto optimal fronts, and demonstrated its efficacy usin...
Article
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To better understand the sensitivity of berry size and grapevine photosynthesis to water stress, and determine the soil water potential (ψ) threshold for scheduling irrigation during the maturation stage, we simultaneously measured berry size with photographs, leaf net photosynthesis with a portable meter, and ψ with tensiometers during the drying...
Preprint
Full-text available
Runoff prediction has an important guiding role in the planning and management of regional water resources, flood prevention and drought resistance, and can effectively predict the risk of changes in regional water resources. This study used 12 runoff prediction methods to predict the runoff of four hydrological stations in the Hanjiang River Basin...
Preprint
Full-text available
The Qinghai-Tibet Plateau (TP) is one of the most sensitive areas to climate change, and its ecological environment changes directly or indirectly reflect the global climate change trend. The snow cover ratio (SCR) is an important indicator reflecting the climate and environmental changes of the TP. The daily remote sensing data of snow cover on th...
Article
Full-text available
Compound dry and hot conditions frequently cause large impacts on ecosystems and societies worldwide. A suite of indices is available for the assessment of droughts and heatwaves, yet there is no index available for incorporating the joint variability of dry and hot conditions at the sub-monthly scale. Here we introduce a daily-scale index, called...
Article
Full-text available
It has become increasingly difficult in recent years to predict precipitation scientifically and accurately due to the dual effects of human activities and climatic conditions. This paper focuses on four aspects to improve precipitation prediction accuracy. Five decomposition methods (time-varying filter-based empirical mode decomposition (TVF-EMD)...
Preprint
Full-text available
The source region of the Yangtze River (SRYR) is located in the hinterland of the Tibetan Plateau (TP). The natural environment is hash, and the hydrological and meteorological stations are less distributed, making the observed data are relatively scarce. In order to overcome the impact of lack of data, the China Meteorological Forcing Dataset (CMF...
Article
Hydrological drought evolution (development and recovery) is directly related to the amount of precipitation transformed into effective streamflow. However, how hydrological drought alters the precipitation-streamflow relationship, and how the precipitation-streamflow relationship affects the hydrological drought development and recovery, have not...
Article
Drought is a severe and chronic natural hazard that deeply affects production and livelihoods. Its characteristics and propagation have been extensively discussed, but the effects of temperature, evapotranspiration, and runoff on drought under different carbon emission conditions are still worth considering. Combining with the release of the Sixth...
Article
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Availability of precipitation data at high spatial and temporal resolution is crucial for the understanding of precipitation behaviors that are determinant for environmental aspects such as hydrology, ecology, and social aspects like agriculture, food security, or health issues. This study evaluates the performance of 3B42-V7 satellite-based precip...
Article
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Flash floods can be characterized by several variables. Of these, soil moisture (SM) is an important environmental factor that plays a key role in hydrological and ecological processes and affects the mechanisms that cause flash floods. To more accurately determine the occurrence probability of flash floods, the combined effects of soil moisture an...
Article
Hydrological drought usually lags behind meteorological drought. Obtaining the propagation threshold (PT) from meteorological drought to hydrological drought is important for providing early warnings of hydrological drought. Previous studies have only used single timescales to characterize PT; however, a single timescale cannot accurately describe...
Article
With a service for the most developed economy and dense population in China, the water use of Guangdong province shows distinct regional difference and is subject to multiple driving forces. The regional differences of total water use (TWU) and water use efficiency (WUE) for Guangdong province and its four sub-regions (i.e. Pearl River Dealt region...
Article
Waterlogging severely restricts cotton (Gossypium hirsutum L.) production worldwide. To assess the impacts of waterlogging on cotton yield, a series of field experiments with multi-form waterlogging were conducted during four cotton growth stages in Hubei Province, China from 2003 to 2011. Moreover, regional waterlogging events were characterized b...
Article
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Global climate models (GCMs) are used by major climate centers worldwide for global climate forecasting, and predictive performance is one of the most important issues in GCM forecast applications. In addition to spatial plotting that illustrates anomaly correlation at individual grid cells, this study proposes a novel local indicator of spatial as...
Article
Understanding how biophysical processes respond to the surface energy partitioning and water budget is essential for modeling land surface processes. In general, evapotranspiration (ET) associated with vegetation dynamics can function as a vital nexus of the surface energy partitioning and water budget. Here, a dual-source ET model, the GIS-based P...
Article
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To optimize the management of non-point source (NPS) pollution in a changing environment, the cellular automata (CA) and Hydrological Simulation Program-Fortran (HSPF) models were used to study the response mechanism of NPS pollution loads to land use change and different precipitation scenarios. Taking the Dongjiang River Basin as a case study, th...
Article
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Precipitation is one of the most important factors affecting the accuracy and uncertainty of hydrological forecasting. Considerable progress has been made in numerical weather prediction after decades of development, but the forecast products still cannot be used directly for hydrological forecasting. This study used ensemble pro-processor (EPP) to...
Article
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Flash flooding is a phenomenon characterized by multiple variables. Few studies have focused on the extracted variables involved in flash flood risk and the joint probability distribution of the extracted variables. In this paper, a novel methodology that integrates the Apriori algorithm and copula function is presented and used for a flood risk an...
Article
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Downstream stakeholders are often hindered when performing water management decision making based on effective hydrological modeling and streamflow anticipation, due to alterations of river flow caused by upstream damming. Meanwhile, spaceborne altimeters and imagers can provide valuable data for the upper data‐limited reservoirs by monitoring thei...
Article
Previous research on the relationship between urbanization and extreme precipitation has shown that regional and global anthropogenic changes have made extreme precipitation events more frequent. The purpose of this research was to explore changes in the variability of extreme precipitation in urban areas that underwent different degrees of urbaniz...