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Effect of grass basal diameter on hydraulic properties and sediment yield processes in gully beds in the dry-hot valley region of Southwest China
Yang, Dan1,2; Xiong, Donghong1,2; Zhang, Baojun1,2; Guo, Min1,2; Su, Zhengan1,2; Dong, Yifan1,2; Zhang, Su1,2; Xiao, Liang1,2; Lu, Xiaoning3
Corresponding AuthorDonghong Xiong
2017
Source PublicationCATENA
ISSN0341-8162
EISSN1872-6887
Volume152Pages:299-310
SubtypeArticle
Abstract

Vegetation is an important factor impacting the hydrodynamic processes of gully beds and further affecting the headward erosion of gullies. Gully erosion is one of the major contributors to severe land degradation in the Yuanmou dry-hot valley region of Southwest China where soil erosion rates are estimated ranging from 8000 to 20,000 t.km(-2).a(-1), with a mean gully distribution density ranging from 3 to 5 km.km(-2). However, few studies have been performed in this area which focused on the influence of the aboveground part of grass on soil erosion under natural conditions in gullies. To quantify the temporal variation of hydraulic properties (i.e., shear stress (tau), Darcy-Weisbach friction factor (resistancef) and Sediment Concentration (SC) and analyse the change trends of hydraulic properties and SC in gully bed along with the downslope direction under different grass basal diameters, a series of in situ scouring experiments were conducted in development areas of gully erosion in the Yuanmou dry-hot valley region. With the grass basal diametet increased from 0 (no grass) to 17 to 43 to 70 to 98 mm in gully beds, the mean shear stress of concentrated flow increased slightly (4.03 to 4.49 Pa) and then decreased obviously (4.49 to 3.45 Pa). On the other hand, increasing trends were obserVed in temporal variations of shear stress for every grass basal diameter and the increase rate varied from 0.05 to 0.18. Whereas no notable regular changes in shear stress were detected in the downslope direction for grass basal diameters of 0 to 43 mm, obviously increasing trends were observed for the grass basal diameters of 70 mm and 98 mm. The resistance f experienced a notable increase with increasing grass basal diameter in this study. A logarithmic growth of resistance f was observed in the gully bed as the experiment progtessed (f= aln ( t + b), P < 0.01), and increasing trends were detected for the resistancefin the downslope direction of the gully bed for all grass basal diameters although regression equation could only be fitted for grass basal diameter of 98 mm (f(98)= 2.438ln (DOH98 2.643), P < 0.01). However, the SC showed an exponential decline with the scouring time. And the SC showed an increasing trend along with the downslope direction of the gully bed in all experiments. In addition, a negative correlation could be detected between SC and resistance f in all five grass basal diameter experiments. In this study, only the disposal for grass basal diaineter of 98 mm was clearly more effective than other disposals in conserving gully bed, which might because grass basal diameter (>= 98 mm) that could coVer a relatively large section of gully bed could exert apparent impact on reducing runoff shear stress, increasing resistance coefficient and then further decline the sediment yield. In contrast, when grass basal diameter was <98 mm, the reduction effect for soil erosion was very limited due to overland concentrated flow could detour around the grass base and erode the gully bed.

KeywordGrass Basal Diameter Hydraulic Properties Sediment Concentration Gully Bed
WOS HeadingsScience & Technology ; Physical Sciences ; Life Sciences & Biomedicine
DOI10.1016/j.catena.2017.01.023
WOS Subject ExtendedGeology ; Agriculture ; Water Resources
Indexed BySCI
WOS KeywordGRAZING MANAGEMENT OPTIONS ; BLACK SPEARGRASS PASTURE ; SOIL-EROSION ; HETEROPOGON-CONTORTUS ; ANIMAL PRODUCTIVITY ; SHEAR-STRESS ; RIPARIAN BUFFER ; RIVER INCISION ; RESEARCH NEEDS ; TOROUD BASIN
Language英语
Quartile2区
TOP
WOS SubjectGeosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS IDWOS:000395218600029
Funding Organization973 Program(2015CB452704) ; National Natural Science Foundation of China(41571277 ; Key Project of "Western Light" Talents Cultivation Program of CAS(Y4R2060060) ; 41671288)
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/18583
Collection山地灾害与地表过程重点实验室
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chengdu Univ Informat Technol, Chengdu 610225, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Yang, Dan,Xiong, Donghong,Zhang, Baojun,et al. Effect of grass basal diameter on hydraulic properties and sediment yield processes in gully beds in the dry-hot valley region of Southwest China[J]. CATENA,2017,152:299-310.
APA Yang, Dan.,Xiong, Donghong.,Zhang, Baojun.,Guo, Min.,Su, Zhengan.,...&Lu, Xiaoning.(2017).Effect of grass basal diameter on hydraulic properties and sediment yield processes in gully beds in the dry-hot valley region of Southwest China.CATENA,152,299-310.
MLA Yang, Dan,et al."Effect of grass basal diameter on hydraulic properties and sediment yield processes in gully beds in the dry-hot valley region of Southwest China".CATENA 152(2017):299-310.
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