Preferential flows and soil moistures on a Benggang slope: Determined by the water and temperature co-monitoring

Yu, Tiantang; He, Yangbo; Duan, Xi; Zou, Zhong; Lin, Lih‐Chang; Chen, Jiazhou

doi:10.1016/j.jhydrol.2017.08.029

Cited by 42 publications

(18 citation statements)

References 54 publications

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“…Under the delayed rainfall pattern, there were three significant response peaks at the 20‐, 40‐, and 50‐cm depths. The response time of the change in SWC was slowest at 50‐cm depth, followed by 40‐cm depth, and then 20‐cm depth, possibly reflecting preferential flow (PF; Tao et al, ).…”

Section: Resultsmentioning

confidence: 99%

“…Before the main peak, the SWC slightly increased at the surface (0–10 cm) and significantly decreased in the middle layer (20–30 cm). At the start of the main peak (500 min), the SWC changed earlier in the lower soil layers than in the upper soil layers, suggesting that PF occurred (Tao et al, ). Soil temperatures also changed with changes in SWC.…”

Section: Resultsmentioning

confidence: 99%

“…Under the advanced rainfall pattern, the SWC increased at 40‐cm depth and then at 50‐cm depth after 10 min of rainfall. This change in SWC was due to matrix flow (Tao et al, ). However, under the delayed rainfall pattern, SWC increased earlier in the lower soil layers than in the upper soil layers, which was indicative of PF (Q. Li et al, ; Tao et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…This change in SWC was due to matrix flow (Tao et al, ). However, under the delayed rainfall pattern, SWC increased earlier in the lower soil layers than in the upper soil layers, which was indicative of PF (Q. Li et al, ; Tao et al, ). Thus, the occurrence of matrix flow or PF depended on the rainfall pattern.…”

Section: Discussionmentioning

confidence: 99%

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Stratification response of soil water content during rainfall events under different rainfall patterns

Yinglan

Wang

Sun

et al. 2018

Hydrological Processes

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Many researchers have studied the influence of rainfall patterns on soil water movement processes using rainfall simulation experiments. However, less attention has been paid to the influence under natural condition. In this paper, rainfall, soil water content (SWC), and soil temperature at 10-, 20-, 30-, 40-, and 50-cm depths were simultaneously monitored at 1-min intervals to measure the variation in SWC (SWCv) in response to rainfall under different rainfall patterns. First, we classified rainfall events into four patterns. During the study period, the main pattern was the advanced rainfall pattern (38% of all rainfall events), whereas the delayed, central, and uniform rainfall patterns had similar frequencies of about 20%. During natural rainfall, rainwater rapidly passed through the top soil layers (10-40 cm) and was accumulated in the bottom layer (50 cm). When a high rainfall pulse occurred, the water storage balance was disturbed, resulting in the drainage of initial soil water from the top layers into the deeper layers. Therefore, the critical function of the top layers and the bottom layers was infiltration and storage, respectively. The source of water stored in the bottom layer was not only rainfall but also the initial soil water in the upper soil layers.Changes in soil temperature at each soil depth were comonitored with SWCv to determine the movement characteristics of soil water under different rainfall patterns.Under the delayed rainfall pattern, preferential flows preferred to occur. Under the other rainfall patterns, matrix flow was the main form of soil water movement. Rainfall amount was a better indicator than rainfall intensity for SWCv in the bottom layer under the delayed rainfall pattern. These results provide insights into the responses of SWCv under different rainfall patterns in northern China.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Stratification response of soil water content during rainfall events under different rainfall patterns

Yinglan

Wang

Sun

et al. 2018

Hydrological Processes

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“…For a better understanding of the high-steep slope of a collapsing wall and the mechanism of collapsing erosion, the engineering characteristics and preferential flows have also been investigated for the profile of the collapsing wall. Some researchers analyzed the spatial variations of shear strength and hydraulic properties in collapsing gullies and evaluated their effects on the collapsing erosion mechanism [14,[18][19][20]. Additionally, researchers have also investigated the variations of chemical composition and physical properties with soil depth in the collapsing gullies and found that the contents of gravel and sand increase while the amount of sesquioxides decreases with an increase of soil depth [21,22].…”

Section: Introductionmentioning

confidence: 99%

Degradation Characteristics of Soil-Quality-Related Physical and Chemical Properties Affected by Collapsing Gully: The Case of Subtropical Hilly Region, China

Feng

Wen

et al. 2019

Sustainability

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In the subtropical hilly areas of China, a collapsing gully, a particular type of permanent gully, poses a great threat to the productivity and sustainability of the local ecological and agricultural systems. However, few studies have been performed regarding the effects of collapsing gully erosion on soil degradation. The aim of this study was to evaluate the effects of collapsing gully erosion on soil-quality-related physical and chemical properties. The collapsing gullies that were severely affected by erosion processes were considered at three stages (initial, active and stable stages) and corresponding soil samples were collected to analyze the spatial variation of the soil physical and chemical quality at each stage. The changes in the properties were assumed to be considerable in the regions affected by the erosion process compared with those unaffected by this process. Soil physical properties were more susceptible than soil nutrients to collapsing gully erosion in different spatial locations. The soil quality index (SQI) system consists of total nitrogen (TN), total phosphorus (TP), pH, capillary porosity (CP), sand content (SA), soil cohesion (SC) and root density (RD). Collapsing gully erosion was found to affect the soil physical and chemical properties by progressively reducing the SQI. The mean SQI value was the lowest in the active stage of the collapsing gully, with a higher soil degradation. For the different spatial positions in the collapsing gullies, the scour channel showed the lowest SQI value. The limiting indicators varied in the different stages or spatial sites in the collapsing gullies.

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Tiny niche terrain induces gully headcut retreat

Wang,

Cai,

Deng

2024

Earth Surf Processes Landf

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Gully erosion damages land resources and endangers human productivity and life, making it a key issue in global research on soil erosion nowadays. Gully headcut retreat (GHR) is the main form of gully erosion. Tiny concave features can be found in many retreating gully heads worldwide, and they are referred to as “niche terrain” in this study. To investigate the association between niche terrain and GHR, relevant research was reviewed on niches and stability analysis of gully heads with niches was modelled and analysed. Studies have shown that not all niches worldwide are identical due to regional differences in internal material–external environmental conditions. Special soil properties, joints, and cracks are the internal material conditions that lead to the formation of niche. External conditions include climate conditions, vegetation conditions, and topography. Water is the driving force for the formation of niche, while vegetation and topography are key factors. Niches can be regarded as the initial stage of GHR in areas where gully erosion is intense. In general, GHR is a composite cyclical process dominated by hydraulic erosion in the early stage and gravitational erosion in the late stage, including niche formation, inward concave formation, free face formation, overhanging soil collapse, and niche reformation. In this study, a model of gully head stability is applied, and it is found that the stability‐based factor of safety decreases exponentially with increasing niche height and crack depth, increases exponentially with increasing niche angle, and decreases quadratically with increasing catchment slope. Summarizing the common characteristics of niche terrains worldwide can facilitate the study of the evolution of gully erosion globally.

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Preferential flows and soil moistures on a Benggang slope: Determined by the water and temperature co-monitoring

Cited by 42 publications

References 54 publications

Stratification response of soil water content during rainfall events under different rainfall patterns

Stratification response of soil water content during rainfall events under different rainfall patterns

Degradation Characteristics of Soil-Quality-Related Physical and Chemical Properties Affected by Collapsing Gully: The Case of Subtropical Hilly Region, China

Tiny niche terrain induces gully headcut retreat

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