A Method Study on Determination of Sediment Content in Water Samples Based on Self-made Differential Pressure Device

Xu Feifei; Wang Jian; Chen Lin; Zou Yi; Yang Chang; Li Jiande

doi:10.13961/j.cnki.stbctb.2022.04.022

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A Method Study on Determination of Sediment Content in Water Samples Based on Self-made Differential Pressure Device

- A Method Study on Determination of Sediment Content in Water Samples Based on Self-made Differential Pressure Device
- Bulletin of Soiland Water Conservation Vol. 42, Issue 4, Pages: 172-178(2022)
- 作者机构：
  
  1. 西北农林科技大学水土保持研究所, 陕西杨凌,712100
  2. 西北农林科技大学资源环境学院, 陕西杨凌,712100
  3. 北京大学城市与环境学院,北京,100871
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2022.04.022
  CLC： S157
- Published：2022
- 稿件说明：
移动端阅览
Xu Feifei, Wang Jian, Chen Lin, et al. A Method Study on Determination of Sediment Content in Water Samples Based on Self-made Differential Pressure Device[J]. Bulletin of Soiland Water Conservation, 2022, 42(4): 172-178.
DOI：

Xu Feifei, Wang Jian, Chen Lin, et al. A Method Study on Determination of Sediment Content in Water Samples Based on Self-made Differential Pressure Device[J]. Bulletin of Soiland Water Conservation, 2022, 42(4): 172-178. DOI： 10.13961/j.cnki.stbctb.2022.04.022.

摘要

[目的

]

开展基于压差测定水样含沙量的方法研究，旨在寻求一种新方法以实现含沙量在野外的快速准确测定。[方法

]

试验基于压差原理，选取4种土壤(土、风沙土、盐碱土与水稻土)分别预制11个含沙量梯度的含沙水样，使用数字式压差计测定含沙水样压强与大气压强之间的差值(简称压差)，建立含沙量与压差的函数关系式。[结果

]

含沙量与压差在0.01的水平下呈极显著线性正相关；对于其中3种含沙水样(土水样、盐碱土水样与水稻土水样)，压差结合理论公式计算含沙量的方法具有可行性，最大相对误差绝对值小于15%，但不适用于风沙土水样。风沙土水样含沙量的测定最大相对误差绝对值高达39%。因此，为了缩小误差，试验通过测定纯水与含沙量为500 kg/m

的水样压差建立修正方程，再结合测定的压差值计算含沙量，发现最大相对误差绝对值小于8%。[结论

]

基于压差测定水样含沙量的方法能较为准确地测定水样含沙量，可为水土保持监测等领域在野外便捷测定含沙量提供一种新思路与方法。

Abstract

[Objective] The method for quickly and accurately measuring sediment concentrations in water samples in the field based on differential pressure was studied.[Methods] Four soil types (including Lou soil

sandy soil

saline-alkali soil

and paddy soil) were chosen to prepare 11 water samples with different sediment concentrations based on the principle of pressure difference. The pressure difference between a water sample and the atmosphere was determined by using digital differential pressure meter (abbreviated as pressure difference) in order to establish the relationship between sediment concentration and pressure difference.[Results] Sediment concentration and pressure difference were linearly and positively correlated (significant at p=0.01). The method of pressure difference combined with a theoretical formula to determine sediment concentration was feasible for three of the water samples (including the Lou soil water sample

the sandy soil water sample

and the paddy soil water sample)

and the absolute value of the maximum relative error was less than 15%. However

the method was not suitable for the sandy soil water sample. The absolute value of the maximum relative error in the determination of sediment concentration for the sandy soil water sample was as high as 39%. Therefore

to reduce the error

a correction equation was established by determining the pressure difference between pure water and water samples with sediment content of 500 kg/m3

and then combined with the measured pressure difference to calculate the sediment concentration. The absolute value of the maximum relative error was found to be less than 8%.[Conclusion] This method can accurately determine the sediment concentrations of water samples. It could provide a new way for conveniently determining sediment concentration in the field for soil and water conservation monitoring.

关键词

Keywords

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