Correction factor to dye-measured flow velocity under varying water and sediment discharges

Zhang, Guanghui; Luo, Rong; Cao, Ying; Shen, Rui-chang; Zhang, X.C.

doi:10.1016/j.jhydrol.2010.05.050

Cited by 98 publications

(96 citation statements)

References 20 publications

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“…After rills were developed on the steep-slope, a main rill was chosen to measure the variables for the subsequent calculation of rill hydraulic parameters. Surface flow velocity in each observing segment was measured 2 to 3 times using dye tracing method, with the aid of a digital stop-watch (Zhang et al, 2010). A 500 mL soft plastic injector with a nozzle of 200 mm in length and 5 mm inner diameter was employed to shoot a jet of potassium permanganate solution into the surface flow at a span distance of 2 m to each observing section.…”

Section: Experimental Set-up and Proceduresmentioning

confidence: 99%

Dynamic processes of soil erosion by runoff on engineered landforms derived from expressway construction: A case study of typical steep spoil heap

Zhang

Gao

Yang

et al. 2015

CATENA

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Section: Experimental Set-up and Proceduresmentioning

confidence: 99%

Dynamic processes of soil erosion by runoff on engineered landforms derived from expressway construction: A case study of typical steep spoil heap

Zhang

Gao

Yang

et al. 2015

CATENA

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“…corante azul). A velocidade média foi então calculada medindo o tempo de percurso da frente da mancha do traçador e se utilizando um fator de correção experimental igual a 0,67 (Horton et al, 1934;Zhang et al, 2010).…”

Section: Methodsunclassified

Desempenho da modelagem cinemática do escoamento superficial para chuvas intermitentes em solos com cobertura morta

Abrantes

Lima²,

Montenegro

2015

Rev. bras. eng. agríc. ambient.

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R E S U M OA cobertura morta é uma prática de manejo imprescindível para o controle do escoamento superficial. Condições antecedentes de umidade do solo, padrões de precipitação e cobertura do solo têm relevância no desprendimento, no transporte das partículas sólidas e na geração de escoamento superficial. Este estudo objetivou avaliar o desempenho do modelo da onda cinemática no escoamento superficial oriundo de eventos de chuvas intermitentes de múltiplos picos considerando-se diferentes densidades de cobertura. Ensaios de laboratório foram realizados em um canal de terra e com um simulador de chuva adotando-se três cenários de cobertura do solo: i) Solo nu; ii) Cobertura morta, com densidade de 2 t ha -1 e iii) Cobertura morta com densidade de 4 t ha -1. Os experimentos mostram, de forma bem clara, que a cobertura morta afeta fortemente o escoamento superficial. A intermitência e as características das chuvas sequenciais também influenciaram tal processo. O modelo da onda cinemática previu eficientemente o escoamento superficial apresentando coeficiente de Nash-Sutcliffe superior a 0,75 e coeficiente de determinação maior que 0,90, para todas as condições de cobertura, quando a umidade inicial do solo era elevada.Performance of kinematic modelling of surface runoff for intermittent rainfall on soils covered with mulch A B S T R A C TMulching is an important management practice for overland flow control. Antecedent soil moisture conditions, rainfall patterns, and soil cover play an important role in the detachment and transport of soil particles and runoff generation. This study aimed to investigate the performance of kinetic wave model in simulating overland flow from multiple step intermittent rainfall events, considering distinct mulch densities. Laboratory experiments were conducted using a soil flume and rainfall simulator adopting three soil cover scenarios: i) Bare soil; ii) Low mulch cover density of 2 t ha . The laboratory experiments clearly show that mulch strongly affects surface runoff. Intermittency and characteristics of sequential rainfall events also influenced such process. The kinematic wave model predicted efficiently surface runoff, presenting Nash-Sutcliffe coefficients higher than 0,75 and determination coefficients higher than 0,90, for all cover conditions, when initial soil moisture was high. Palavras-chave:simulador de laboratório onda cinemática conservação do solo

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“…The time between the start of each inflow event and runoff at the plot outlet was recorded in each experiment. Surface flow velocity in each slope segment was measured and averaged by 2-3 duplicates using tracing method with potassium permanganate, assisted by a digital stopwatch (Zhang et al 2010). A 500-ml soft plastic injector with a nozzle of 200 mm in length and 5 mm in inner diameter was employed to shoot a jet of potassium permanganate solution into the surface flow at a span distance of 2 m from injecting point to observing section.…”

Section: Experimental Setup and Runoff Simulationsmentioning

confidence: 99%

Downslope runoff and erosion response of typical engineered landform to variable inflow rate patterns from upslope

Zhang

Gao

et al. 2015

Nat Hazards

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Downslope wash-scour erosion driven by upslope inflow from compacted platform plays an important role in the acceleration of water and soil loss from engineered landforms. To explore the quantitative effects of variable upslope runoff on downslope runoff and erosion, a typical abandoned spoil deposit derived from the construction of Shenfu Expressway was selected to conduct a set of field runoff scouring experiments on steep slope (72.7 %). Four types of upslope inflow rate patterns including constant inflow rate pattern and earlier, intermediately, as well as later peak inflow rate patterns were designed dependent on different rainfall patterns and the timing for peak inflow rate (total inflow amount was kept constant). Thus, the downslope runoff and erosion response of the selected abandoned spoil deposit under variable upslope inflow conditions were investigated, and the results reveal that: (i) Maximum peak runoff intensity and the timing for the maxima were greatly impacted by upslope inflow rate patterns; however, little impact was exerted on total surface runoff; total runoff from the inflow events with earlier, later, and intermediately peak inflow rate increased by 20.6, 11.7, and 8.5 % in comparison with that

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Correction factor to dye-measured flow velocity under varying water and sediment discharges

Cited by 98 publications

References 20 publications

Dynamic processes of soil erosion by runoff on engineered landforms derived from expressway construction: A case study of typical steep spoil heap

Dynamic processes of soil erosion by runoff on engineered landforms derived from expressway construction: A case study of typical steep spoil heap

Desempenho da modelagem cinemática do escoamento superficial para chuvas intermitentes em solos com cobertura morta

Downslope runoff and erosion response of typical engineered landform to variable inflow rate patterns from upslope

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