坡度对3种单环法测量坡地饱和导水率的影响

doi:10.16843/j.sswc.2018.02.004

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Abstract [Background] Soil saturated hydraulic conductivity (K_s) of sloping field is a key parameter to predict soil and water losses, but K_s is mostly measured on the flat land. Therefore, directly measuring saturated hydraulic conductivity on slopes is practically important. The objective of this paper is to study the effect of slope gradient on K_s by three single-ring infiltrometer methods in order to select a suitable method for slope land.[Methods] The slope gradients of 0, 5°, 10°, 15° and 20° in sandy soil, Loessial soil and Lou soil were selected and K_s was measured by three single-ring infiltrometer methods (i.e., two-ponding depth, one-ponding depth and BEST methods), which usually were used for flat lands. All measurements were conducted on undisturbed soil.[Results] 1) On flat soil surface, all three methods obeyed the same order for K_s of different soils as sandy soil > Loessial soil > Lou soil. The K_s of three soils by single-ring BEST infiltrometer were 2.9, 2.1 and 4.5 times, which were larger than those by single-ring two-ponding depth infiltrometer. If cutting-ring infiltrometer was taken as standard, single-ring BEST infiltrometer significantly overestimated the K_s of the Loessial and Lou soil, but the results by single-ring two-ponding depth infiltrometer and single-ring one-ponding depth (10 cm) infiltrometer were close to that by cutting-ring infiltrometer. 2) K_s measured by single-ring two-ponding depth infiltrometer increased with the increase of slope gradient and there was a significant linear correlation between them. The K_s of three soils by single-ring BEST infiltrometer decreased with the increase of slope gradients and this method was affected distinctly by slope gradient due to the change of the ponded water area inside the ring. 3) Under flat ground condition, the results of single-ring one-ponding depth (10 cm) infiltrometer were comparable to single-ring two-ponding depth infiltrometer, but the single-ring one-ponding depth (5 cm) infiltrometer overestimated the results. 4) In sandy soil, Loessial soil and Lou soil, there was no significant difference of K_s between slope<10° and flat land by above 3 methods, but significant while slope >10° (P<0.05).[Conclusions] Therefore, single-ring BEST infiltrometer is not suitable for measuring K_s in sloping field. Single-ring two-ponding depth infiltrometer or single-ring one-ponding (10 cm) depth infiltrometer can be used to correctly measure K_s if the slope is <10°. Furthermore, the calculating equations for saturated hydraulic conductivity by these sing-ring methods should be revised for the three soils in the loess regions if the slope gradient is >10°.

Key words： infiltration soil saturated hydraulic conductivity slope gradient single-ring two-ponding depth infiltrometer single-ring BEST infiltrometer

Received: 10 November 2017

PACS:

S152.7+2

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	YONG Chenxu
	FAN Jun
	WANG Sheng

Cite this article:

YONG Chenxu,FAN Jun,WANG Sheng. Effects of slope gradient on the soil saturated hydraulic conductivity of sloping land measured by three single-ring infiltrometers[J]. SSWC, 2018, 16(2): 24-30.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2018.02.004 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2018/V16/I2/24

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