Junqiang Xia
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View article: Influence of Sub‐Cloud Evaporation on Precipitation Isotopes: Insights From Hourly‐Scale Meteorological Assessment in a Large Lake in the East Asian Monsoon Region
Influence of Sub‐Cloud Evaporation on Precipitation Isotopes: Insights From Hourly‐Scale Meteorological Assessment in a Large Lake in the East Asian Monsoon Region Open
Sub‐cloud evaporation is a critical aspect of the hydrological cycle, reducing surface precipitation totals and altering the stable isotopic composition as raindrops fall from the cloud base towards the surface. However, isotopic modelling…
View article: An overview of flood evacuation planning: Models, methods, and future directions
An overview of flood evacuation planning: Models, methods, and future directions Open
Floods are one of the most destructive disasters and require a range of structural and non-structural measures to reduce their impacts. Evacuation is an effective non-structural measure to increase the resilience of flood-affected areas. T…
View article: Effects of Grass Cover on the Overland Soil Erosion Mechanism Under Simulated Rainfall
Effects of Grass Cover on the Overland Soil Erosion Mechanism Under Simulated Rainfall Open
Existing research on soil erosion primarily focuses on the individual effects of factors such as rainfall intensity, slope gradient, grass cover, and soil characteristics, with limited exploration of the interactions among these factors. T…
View article: A Probabilistic Process‐Based Model of Bank Erosion and Its Application in the Middle Yangtze River
A Probabilistic Process‐Based Model of Bank Erosion and Its Application in the Middle Yangtze River Open
Bank erosion in a natural alluvial river is influenced not only by near‐bank hydraulic conditions but also predominantly by bank soil properties. These factors exhibit considerable uncertainties, which are seldom considered in previous ban…
View article: Relation between bank erosion and bed incision in the braided reach of the Lower Yellow River undergoing channel degradation
Relation between bank erosion and bed incision in the braided reach of the Lower Yellow River undergoing channel degradation Open
A general increase in the bankfull width and depth is found in downstream reaches because of upstream damming, especially in the braided reach of the Lower Yellow River (LYR), but the magnitude of bank erosion and its relation with bed inc…
View article: Channel Morphological Characteristics and Morphodynamic Processes of Large Braided Rivers in Response to Climate‐Driven Water and Sediment Flux Change in the Qinghai‐Tibet Plateau
Channel Morphological Characteristics and Morphodynamic Processes of Large Braided Rivers in Response to Climate‐Driven Water and Sediment Flux Change in the Qinghai‐Tibet Plateau Open
With rising air temperature and precipitation, water and sediment fluxes in the Source Region of the Yangtze River (SRYR) have increased since 2000s. Nonetheless, the response of braided river morphology to climate‐driven water and sedimen…
View article: Formation condition for concave-bank deposition in the meanders of the Middle Yangtze River and its application
Formation condition for concave-bank deposition in the meanders of the Middle Yangtze River and its application Open
In what kind of meanders concave-bank deposition (CBD) can occur remains an open question. This study investigated the characteristics and major influencing factors of CBD in the meanders of the Middle Yangtze River (MYR), and proposed a f…
View article: Channel erosion and its impact on environmental flow of riparian habitat in the Middle Yangtze River
Channel erosion and its impact on environmental flow of riparian habitat in the Middle Yangtze River Open
Evaluating environmental flow (EF) is pivotal for conserving and restoring riverine ecosystems. Yet, prevalent EF evaluations presume that a river reach's hydraulic conditions are exclusively governed by inflow discharge, presupposing a st…
View article: Variations of water, carbon isotopic characteristics and intrinsic water use efficiency of vegetation in the typical beach wetland of Lake Poyang, China
Variations of water, carbon isotopic characteristics and intrinsic water use efficiency of vegetation in the typical beach wetland of Lake Poyang, China Open
在极端水文事件频发和人类活动影响加剧的背景下,鄱阳湖水文情势的异常变动给洲滩湿地植物带来了一系列影响。为进一步了解鄱阳湖湿地植物水分利用来源和内在水分利用效率(iWUE)的季节变化规律,揭示优势植物在生长过程中对不同水分变化的适应策略,于2020年12月-2021年5月在鄱阳湖国家级自然保护区蚌湖和修河之间的典型洲滩湿地上设置监测断面,对灰化苔草(Carex cinerascens)、南荻(Triarrhena lutarioriparia)植物样品及其潜在水源样品进行系统…
View article: Variations of stable isotopic characteristics of shallow lake-river water system and its indicative significance in Lake Poyang wetland, China
Variations of stable isotopic characteristics of shallow lake-river water system and its indicative significance in Lake Poyang wetland, China Open
为深入认识鄱阳湖湿地区域水循环过程,于2019年1-12月在鄱阳湖国家级自然保护区对降水、河流水、主要碟形湖水进行系统采集,综合分析碟形湖-河流水稳定同位素的动态变化特征及其指示意义。结果表明,鄱阳湖湿地修河和赣江的同位素组成具有明显的季节性变化规律,4月河水同位素最为富集,5-7月逐渐贫化,之后呈现出不断富集的变化趋势,整体上与降水同位素的时间变化特性相似。在空间分布上,各段河水的同位素组成均具有相对稳定的沿程分布特征,赣江在修河汇入点上、下游的同位素特性在大多数月份没有…
View article: Integrating GEDI and Sentinel-2 data for mapping height dynamics of floodplain representative Poaceae vegetation in the Middle Yangtze River
Integrating GEDI and Sentinel-2 data for mapping height dynamics of floodplain representative Poaceae vegetation in the Middle Yangtze River Open
植物是大型河流生态系统的重要成分。但受气候变化和人类活动影响,洲滩禾本科植物高度不断发生调整,进而影响洲滩生境和河道防洪安全,故需长期监测。近年来,伴随着星载激光雷达(LiDAR)技术的发展,应用LiDAR卫星数据反演洲滩禾本科植物高度成为一种可能。本文融合新一代星载LiDAR系统GEDI数据与 Sentinel-2影像,基于XGBoost算法构建了考虑物候、累积温度与光合有效辐射指标的洲滩典型禾本科植物高度外推模型,同时利用Attention-UNet算法搭建了洪淹区域识…
View article: Hydrodynamic and Morphological Adaptation of Two Consecutive Sharp Bends of the Middle Yangtze River to Upstream Damming
Hydrodynamic and Morphological Adaptation of Two Consecutive Sharp Bends of the Middle Yangtze River to Upstream Damming Open
It remains an open question how the hydrodynamics and morphology in sharp meander bends adapt to the changes in flow and sediment conditions induced by upstream damming. This study reports a comprehensive investigation into the morphologic…
View article: Fine‐scale damage assessment of urban flooding based on the 1D/2D coupled hydrodynamic model
Fine‐scale damage assessment of urban flooding based on the 1D/2D coupled hydrodynamic model Open
Due to the high population density and economic property in urban environments, urban flooding can result in substantial economic losses. However, accurate urban flood modeling and assessing the associated damages are challenging due to co…
View article: Development of Reinforced Concrete Piles in the Lower Yellow River, China
Development of Reinforced Concrete Piles in the Lower Yellow River, China Open
Controlling the river regime in the lower wandering reaches of the Yellow River Basin is important for ecological protection and high-quality development. This study reviews the development of pile groynes suitable for wandering rivers. As…
View article: Evolution characteristics of mid‐channel bars with a typical high/low bank structure in the Middle Yangtze River
Evolution characteristics of mid‐channel bars with a typical high/low bank structure in the Middle Yangtze River Open
Adjustments in mid‐channel bars (MCBs) often influence the stability of channel regime and the safety of river navigation in anabranching reaches. This study aims to investigate the evolution characteristics of the low and high parts of MC…
View article: Longitudinal variation of channel evolution along the middle Yangtze River after the operation of the Three Gorges Project
Longitudinal variation of channel evolution along the middle Yangtze River after the operation of the Three Gorges Project Open
三峡工程运行后,坝下游河道发生持续冲刷。本文研究了长江中游(955 km)不同河段沿程演变差异及其原因。总体而言,河床形态调整幅度自上而下减弱,这是因为在河床持续冲刷过程中,水流含沙量沿程恢复,故越往下游冲刷相对缓慢。平面形态方面,长江中游岸线崩退及洲滩变形的强度均呈沿程减弱趋势,且在荆江河段最为显著。断面形态方面,河床冲深幅度在宜枝下段>荆江河段>宜枝上段>城汉河段>汉湖河段。理论上距离三峡工程最近的河段冲刷应最为剧烈,但由于宜枝上段床沙粗化显著,限制了冲刷的进一步发展。…
View article: Evolution process and mechanism of mid-channel bars composed of different bed materials in the Upper Jingjiang Reach after the Three Gorges Project operation
Evolution process and mechanism of mid-channel bars composed of different bed materials in the Upper Jingjiang Reach after the Three Gorges Project operation Open
三峡及上游梯级水库群运用后,大坝下游江心洲以冲刷为主,直接影响分汊河段河势条件及航道边界的稳定性。本文采用卫星遥感影像、实测水沙及固定断面床沙级配等资料,分析上荆江枝江、沙市河段中不同河床组成江心洲的演变过程及其机理。结果表明:①三峡水库蓄水后(2003-2019年),沙市段沙质江心洲较枝江段卵石夹沙质江心洲萎缩更为显著,出露面积的减幅分别达31%和24%。②以关洲和金城洲分别代表卵石夹沙质和沙质江心洲,三峡工程运用后关洲洲头形态较为稳定,受无序采砂的影响其沙质组成的洲尾面…
View article: A unified discharge capacity formula of clogged grate inlets
A unified discharge capacity formula of clogged grate inlets Open
To investigate the influence of different clogging degrees of a street inlet on its discharge capacity, an experimental campaign with the clogging degree of inlet grate and connection tube varying from 0.0 to 0.75 were conducted in a doubl…
View article: A Method for Digital Terrain Reconstruction Using Longitudinal Control Lines and Sparse Measured Cross Sections
A Method for Digital Terrain Reconstruction Using Longitudinal Control Lines and Sparse Measured Cross Sections Open
Using longitudinal control lines and sparse measured cross sections with large spaces, a new method for quickly reconstructing digital terrains in natural riverways is presented. The longitudinal control lines in a natural riverway, mainly…