Characteristics of Runoff, Sediment and Nitrogen and Phosphorus Output of Steep Slope of Abandoned Soil Deposits Under Scouring Flow

FAN Tongtong; WANG Dongmei; ZHANG Zezhou; ZHANG Peng; LIU Xinyu

doi:10.13870/j.cnki.stbcxb.2023.04.014

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Characteristics of Runoff, Sediment and Nitrogen and Phosphorus Output of Steep Slope of Abandoned Soil Deposits Under Scouring Flow

更新时间：2025-03-12

- Characteristics of Runoff, Sediment and Nitrogen and Phosphorus Output of Steep Slope of Abandoned Soil Deposits Under Scouring Flow
- Vol. 37, Issue 4, Pages: 101-109(2023)
- 作者机构：
  
  北京林业大学水土保持学院,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2023.04.014
  CLC： S157.1
- Published：2023
- 稿件说明：
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FAN Tongtong, WANG Dongmei, ZHANG Zezhou, et al. Characteristics of Runoff, Sediment and Nitrogen and Phosphorus Output of Steep Slope of Abandoned Soil Deposits Under Scouring Flow[J]. 2023, 37(4): 101-109.
DOI：

FAN Tongtong, WANG Dongmei, ZHANG Zezhou, et al. Characteristics of Runoff, Sediment and Nitrogen and Phosphorus Output of Steep Slope of Abandoned Soil Deposits Under Scouring Flow[J]. 2023, 37(4): 101-109. DOI： 10.13870/j.cnki.stbcxb.2023.04.014.

摘要

为揭示工程堆积体平台汇流造成的水沙及氮磷养分流失特征

以矿区堆土场为研究对象

采用室内放水冲刷试验

研究不同上方来水流量(1.7

2.3

2.9 L/min)和坡度(25°

30°

35°)下地表径流、壤中流及侵蚀泥沙产生过程

分别测定氮磷养分浓度并计算流失量及贡献占比。结果表明:蒙东地区覆土排土场边坡产流方式主要为地表径流

随坡度和冲刷流量的增大

地表径流量增大

壤中流量减小。产沙量随坡度的增大先增大后减小

侵蚀产沙的临界坡度在30°附近。地表径流中铵态氮及磷酸盐流失浓度均大于壤中流

硝态氮浓度在冲刷流量较大(2.9 L/min)时低于壤中流。径流中磷酸盐及侵蚀泥沙中氮磷损失均随坡度的增大先增大后减小。冲刷流量越大

地表径流及侵蚀泥沙中的氮、磷流失量越多。径流中养分流失量表现为硝态氮＞铵态氮＞磷酸盐。侵蚀泥沙是磷酸盐的主要输出途径

占流失总量的59.69%以上;氮素流失量仅在坡度30°时表现为侵蚀泥沙中最大

在25°

35°坡面

地表径流为氮素的主要流失途径

小流量(1.7

2.3 L/min)时壤中流输出的氮素次之。

Abstract

In order to reveal the characteristics of runoff and sediment and nutrient loss path of on steep slope caused by platform inflow of engineering soil deposits

a laboratory scouring experiment

designed to have three scouring inflow rates (1.7

2.3

2.9 L/min) and three slope gradients (25°

30°

35°)

was conducted on disposal sites in opencast coal mine to research the processes of surface runoff

interflow and sediment and measure the concentration of nitrogen and phosphorus in these for calculating the nutrient loss and contribution. The results indicated as follows: Surface runoff was the main type of runoff generation in earth-covered engineering slope in eastern Inner Mongolia. With the increase of slope gradient and scouring inflow rates

surface runoff increased but interflow decreased. The sediment yield rose first and then decreased with the increase of slope gradient

and the critical slope gradient was about 30°. The loss concentrations of ammonium nitrogen and phosphate in surface runoff were higher than those in interflow

and the concentrations of nitrate nitrogen were lower when the scouring flow was larger (2.9 L/min). The loss of phosphate in runoff and nitrogen and phosphorus in eroded sediment firstly increased and then decreased with the increase of slope gradient. The loss of nitrogen and phosphorus from surface runoff and sediment increased with the increase of scouring inflow rates. The amount of nutrient loss in runoff was nitrate nitrogen > ammonium nitrogen > phosphate. Erosion sediment was always the main export route of phosphate

accounting for more than 59.69% of the total loss. The maximum nitrogen loss occurred only when the slope gradient was 30°

while on the 25°and 35°slope

surface runoff was the main route of nitrogen loss

at low inflow rates (1.7

2.3 L/min)

the nitrogen output from interflow was the second.

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