Rainfall-runoff processes in the Loess Plateau, China: Temporal dynamics of event rainfall-runoff characteristics and diagnostic analysis of runoff generation patterns

Wu, Qiang; Zhang, Zhaoxi; Zhang, Guodong; Jian, Shengqi; Zhang, Li; Ran, Guang; Zhao, Dingxin; Lv, Xizhi; Hu, Caihong

doi:10.5194/hess-2020-431

Cited by 4 publications

(3 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We assume that the simulation occurs in June, July, and August, respectively, then each RC needs to be modified. The runoff coefficients of the permeable areas under the three rainfall events are assigned weighting factors 1.08, 1.09, and 1.10 [39].…”

Section: 𝑞 =mentioning

confidence: 99%

Multi-Source Data Fusion and Hydrodynamics for Urban Waterlogging Risk Identification

Zhang

Zeng

Huang

et al. 2023

IJERPH

View full text Add to dashboard Cite

The complex formation mechanism and numerous influencing factors of urban waterlogging disasters make the identification of their risk an essential matter. This paper proposes a framework for identifying urban waterlogging risk that combines multi-source data fusion with hydrodynamics (MDF-H). The framework consists of a source data layer, a model parameter layer, and a calculation layer. Using multi-source data fusion technology, we processed urban meteorological information, geographic information, and municipal engineering information in a unified computation-oriented manner to form a deep fusion of a globalized multi-data layer. In conjunction with the hydrological analysis results, the irregular sub-catchment regions are divided and utilized as calculating containers for the localized runoff yield and flow concentration. Four categories of source data, meteorological data, topographic data, urban underlying surface data, and municipal and traffic data, with a total of 12 factors, are considered the model input variables to define a real-time and comprehensive runoff coefficient. The computational layer consists of three calculating levels: total study area, sub-catchment, and grid. The surface runoff inter-regional connectivity is realized at all levels of the urban road network when combined with hydrodynamic theory. A two-level drainage capacity assessment model is proposed based on the drainage pipe volume density. The final result is the extent and depth of waterlogging in the study area, and a real-time waterlogging distribution map is formed. It demonstrates a mathematical study and an effective simulation of the horizontal transition of rainfall into the surface runoff in a large-scale urban area. The proposed method was validated by the sudden rainstorm event in Futian District, Shenzhen, on 11 April 2019. The average accuracy for identifying waterlogging depth was greater than 95%. The MDF-H framework has the advantages of precise prediction, rapid calculation speed, and wide applicability to large-scale regions.

show abstract

Section: 𝑞 =mentioning

confidence: 99%

Multi-Source Data Fusion and Hydrodynamics for Urban Waterlogging Risk Identification

Zhang

Zeng

Huang

et al. 2023

IJERPH

View full text Add to dashboard Cite

show abstract

“…In contrast, the relationship between SSY and rainfall indices weakened in the later period , which may denote the influence of intensive human interventions on surface hydrological processes. As Wu et al (2020) reported, long-term land use and vegetation changes led to increasing catchment wetness in the LP catchments and a shift to Dunne overland flow regime (Dunne, 1978), which indicated that more rainfall could be intercepted by vegetation cover and leaf litter cover, resulting in higher infiltration and longer travel times (Hu, Zhang, et al, 2020;Hu, Zhao, et al, 2020;L opez-Taraz on et al, 2009;Zhu et al, 2020). For example, an observed event on July 22, 2017 with a basin-averaged rainfall of 82.1 mm, only pro- Among these variables, a strong linear/proportional relationship can be examined between SSY and Q, as confirmed by Zheng (2018).…”

Section: Relationships Of Rainfall Runoff and Suspended Sediment Conc...mentioning

confidence: 99%

Rainfall, runoff, and suspended sediment dynamics at the flood event scale in a Loess Plateau watershed, China

Tian

Feng

Zhao

et al. 2022

Hydrological Processes

View full text Add to dashboard Cite

River runoff and suspended sediment play a critical role in the chemical, physical, biological processes of Earth's ecosystems. We assessed the temporal changes in runoff and sediment load at both the annual and event scales in the Gushanchuan watershed in the middle reaches of the Yellow River. A total of 330 events, from 1955 to 2018, were selected to evaluate the relationships between rainfall, runoff, and suspended sediment load at the Gaoshiya gauging station. Significant reductions were examined in the maximum runoff peaks, suspended sediment concentration, total runoff, suspended sediment yield, and ratio of event runoff to annual total, whereas the ratio of event sediment yield to annual total remained relatively stable. Hysteresis analysis suggested that the complex loops, anti‐clockwise, and figure‐eight loops accounted for 93.7% of the total events in the watershed. High positive correlations were observed between the flood‐event sediment yield, runoff volume, maximum runoff peaks, and total rainfall amount. The flow‐sediment relationship can be well fitted by the proportional model, and was weaker in 1997–2018 than those in the periods of 1955–1979 and 1980–1996. Runoff during the rising limb of the event significantly contributed to the total runoff and sediment yield. Land use changes and various soil conservation practices were responsible for the decrease in the flood frequency and magnitude. The results of this study provide useful insights into the relationships between rainfall, runoff, and suspended sediment dynamics, and their responses to soil conservation practices.

show abstract

“…The flow mechanism corresponding to the rapid response of the stream to the precipitation event is likely due to infiltration excess overland flow rather than saturated overland flow at the study site based on the dry environment and the thick, loess covered characteristics in northern Loess Plateau. 340 rainfall-runoff events were analysed using the event identification method in five typical catchments on the Chinese Loess Plateau (Wu et al, 2020), and also concluded that the Horton overland flow dominates the majority of runoff generation.…”

Section: Flow Mechanismsmentioning

confidence: 99%

Rainfall intensity affects runoff responses in a semi‐arid catchment

Tao¹,

Li²,

Cheng

et al. 2021

Hydrological Processes

View full text Add to dashboard Cite

The source and hydrochemical makeup of a stream reflects the connectivity between rainfall, groundwater, the stream, and is reflected to water quantity and quality of the catchment. However, in a semi-arid, thick, loess covered catchment, temporal variation of stream source and event associated behaviours are lesser known. Thus, the isotopic and chemical hydrographs in a widely distributed, deep loess, semi-arid catchment of the northern Chinese Loess Plateau were characterized to determine the source and hydrochemical behaviours of the stream during intra-rainfall events.Rainfall and streamflow were sampled during six hydrologic events coupled with measurements of stream baseflow and groundwater. The deuterium isotope ( 2 H), major ions (Cl − , SO 4 2− , NO 3 − , Ca 2+ , K + , Mg 2+ , and Na + ) were evaluated in water samples obtained during rainfall events. Temporal variation of 2 H and Cl − measured in the groundwater and stream baseflow prior to rainfall was similar; however, the isotope compositions of the streamflow fluctuated significantly and responded quickly to rainfall events, likely due to an infiltration excess, overland dominated surface runoff during torrential rainfall events. Time source separation using 2 H demonstrated greater than 72% on average, the stream composition was event water during torrential rainfall events, with the proportion increasing with rainfall intensity. Solutes concentrations in the stream had loglinear relationships with stream discharge, with an outling anomaly with an example of an intra-rainfall event on Oct. 24, 2015. Stream Cl − behaved nonconservative during rainfall events, temporal variation of Cl − indicated a flush and washout at the onset of small rainfall events, a dilution but still high concentration pattern in high discharge and old water dominated in regression flow period. This study indicates rainfall intensity affects runoff responses in a semi-arid catchment, and the stored water in the thick, loess covered areas was less connected with stream runoff. Solute transport may threaten water quality in the area, requiring further analysis of the performance of the eco-restoration project.

show abstract

Rainfall-runoff processes in the Loess Plateau, China: Temporal dynamics of event rainfall-runoff characteristics and diagnostic analysis of runoff generation patterns

Cited by 4 publications

References 33 publications

Multi-Source Data Fusion and Hydrodynamics for Urban Waterlogging Risk Identification

Multi-Source Data Fusion and Hydrodynamics for Urban Waterlogging Risk Identification

Rainfall, runoff, and suspended sediment dynamics at the flood event scale in a Loess Plateau watershed, China

Rainfall intensity affects runoff responses in a semi‐arid catchment

Contact Info

Product

Resources

About