Search

Your search keyword '"dip slope"' showing total 3 results
Start Over Descriptor "dip slope" Journal journal of hydrology
3 results on '"dip slope"'

1. Differences in soil water movement between the dip and anti-dip slopes of a karst trough valley.

Author

Tian, Xing, Wu, Wei, Zeng, Sibo, Li, Yao, and Jiang, Yongjun

Subjects
*SOIL moisture, *KARST, *SOIL texture, *SOIL structure, *STABLE isotopes
Abstract

[Display omitted] • The soil water movement of dip/anti-dip karst slopes is revealed by water isotopes. • Precipitation drives the seasonal variations of soil water isotopes. • Preferential flow is dominant in the upper soil layers on dip and anti-dip slopes. • Preferential flow is deeper on anti-dip versus dip karst slopes. • Soil texture and structure regulate the spatial movement of soil water. Exploring temporal and spatial variations in soil water processes is crucial for identifying the ecological water supply capacity of soil and understanding hydrologic cycles within karst catchments. However, the existing body of knowledge related to soil water dynamics across dip and anti-dip slopes in karst landscapes remains limited. To address this gap, this study investigated soil water dynamics in a karst trough valley (KTV) in southwest China, using stable isotopes (δD and δ18O) from eight sampling sites and precipitation data from April 2017 to November 2018. Our findings suggest that seasonal variations in soil water isotopes are primarily influenced by climatic factors, with soil water lagging behind rainwater isotopes by one to four months due to differences in the residence time of precipitation in different soil layers. Spatially, our results reveal the coexistence of diffuse and preferential flows on both dip and anti-dip slopes. Specifically, on the dip slope, preferential flow dominates above 20 cm, while diffuse flow prevails below this depth. In contrast, on the anti-dip slope, preferential flow is prominent above 40 cm depth, while diffuse flow dominates beneath this threshold. These spatial patterns not only impact the ecological water and nutrient supply capacity of soil but they also contribute to distinct patterns in vegetative growth on both slopes. In turn, vegetation growth facilitates preferential flow pathways, establishing a positive feedback loop between soil water movement and vegetative cover. These findings may lead to a deeper understanding of soil water processes on the dip and anti-dip slopes of KTVs and provide crucial insights into the relationship between soil water and vegetative growth in similar karst landforms. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

2. Role of rock dip angle in runoff and soil erosion processes on dip/anti-dip slopes in a karst trough valley

Author

Wubing Li, Fengling Gan, Binghui He, and Ziyang Qin

Subjects
Dip slope, geography, geography.geographical_feature_category, fungi, Trough (geology), Magnetic dip, Soil science, Karst, complex mixtures, Erosion, Suspended load, Surface runoff, Geology, Water Science and Technology, Bed load
Abstract

Due to the great difficulty of monitoring surface and underground runoff and sediment yield directly, the surface and underground hydrological processes associated with soil leakage loss in karst trough valleys remain unknown. The objective of this study was to analyse the role of the rock dip angle in the water and soil leakage loss processes, to assess the characteristics of surface and underground runoff and soil erosion and to investigate their conversion relationships using rainfall experiments. The results showed the following. i) At a steep rock dip angle (60°), the underground runoff yield had a shorter stabilization time than the surface runoff yield and that the underground runoff coefficient of the dip slope exceeded 0.5. ii) The surface sediment yield could be divided into the suspended load and the bed load and the underground sediment yield included only the suspended load. On the anti-dip slope, the surface erosion modulus was 0.83–2.50 times the underground erosion modulus. iii) The surface and underground cumulative runoff was linearly correlated with the cumulative sediment yield. The rock dip angle had a significant quadratic relationship with the surface and underground runoff and sediment yield. These results improve the understanding of the surface-underground runoff and soil erosion processes and have significance for preventing water and soil leakage loss on the slopes of karst trough valleys.

Published
2020
Full Text
View/download PDF

3. Hydrological response and soil detachment rate from dip/anti-dip slopes as a function of rock strata dip in karst valley revealed by rainfall simulations

Author

Fengling Gan, Ziyang Qin, and Binghui He

Subjects
Dip slope, geography, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, Water flow, 0207 environmental engineering, Trough (geology), Magnetic dip, 02 engineering and technology, Karst, 01 natural sciences, Flume, Flow velocity, 020701 environmental engineering, Surface runoff, Geomorphology, Geology, 0105 earth and related environmental sciences, Water Science and Technology
Abstract

Rock dip angle plays a significant role in surface hydraulic characteristics and leads to different spatial distribution of water and soil loss in Karst Trough Valleys. In this study, the rock dip angle effect on the hydraulic characteristics and soil detachment rate on dip/anti-dip slopes was explored via rainfall simulations and a steel experimental flume. The rainfall intensities ranged from 30 to 90 mm·h−1, and the rock dip angles varied from 10° to 60°. The results revealed that i) surface runoff on the dip slope was higher than that on the anti-dip slope, whereas underground runoff presented opposite results. The 30° rock dip angle presented the critical flow velocity for the anti-dip slope, and the flow velocity reduced as the rock dip angle of the dip slope increased. ii) Laminar water flow occurred on the dip/anti-dip slope (Re was

Published
2020
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results