Application of Modified Gash Model to Simulate Rainfall Interception of

WU Xiurong; JIN Ming; ZHAO Weijun; JING Wenmao; MA Jian; ZHAO Jingzhong; WANG Rongxin; MA Xuee

doi:10.13870/j.cnki.stbcxb.2020.05.030

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Application of Modified Gash Model to Simulate Rainfall Interception of

更新时间：2025-03-12

- Application of Modified Gash Model to Simulate Rainfall Interception of
- Vol. 34, Issue 5, Pages: 216-222(2020)
- 作者机构：
  
  1. 甘肃省祁连山水源涵养林研究院,甘肃,张掖,734000
  2. 甘肃省森林生态与冻土水文水资源重点实验室,甘肃,张掖,734000
  3. 甘肃省祁连山森林生态系统野外科学观测研究站,甘肃,张掖,734000
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2020.05.030
  CLC： S715.2
- Published：2020
- 稿件说明：
移动端阅览
WU Xiurong, JIN Ming, ZHAO Weijun, et al. Application of Modified Gash Model to Simulate Rainfall Interception of[J]. 2020, 34(5): 216-222.
DOI：

WU Xiurong, JIN Ming, ZHAO Weijun, et al. Application of Modified Gash Model to Simulate Rainfall Interception of[J]. 2020, 34(5): 216-222. DOI： 10.13870/j.cnki.stbcxb.2020.05.030.

摘要

选择祁连山北麓中段排露沟流域青海云杉林为研究对象，基于2019年生长季（5—9月）降水截留观测数据、气象数据和林地调查资料，对其降水截留过程进行分析，运用Gash修正模型模拟青海云杉林降水截留过程。结果表明：研究期间林外大气降雨总量为418.7 mm，降雨主要为中、小雨。穿透雨量、树干茎流量、林冠截留量分别为284.5，6.7，127.5 mm，占大气降雨总量的比例分别为67.94%，1.60%，30.46%。根据Gash修正模型模拟结果，穿透雨量、树干茎流量、林冠截留量值分别为302.2，3.7，112.8 mm，占大气降雨总量的比例分别为72.18%，0.88%，26.94%，与实测值相比，三者的相对误差分别为6.22%，44.78%，11.53%。通过对Gash修正模型参数敏感性分析，参数在-50%~50%的变化过程中对林冠截留率的影响排序为E > c > R > S > St > Pt。总体来说，Gash修正模型在祁连山青海云杉林降水截留的模拟运用中表现出很好的拟合效果，研究成果可为开展祁连山青海云杉林水分循环研究提供一定参考。

Abstract

This study selected Picea crassifolia forest which in the Pailugou catchment of the middle of the northern slope of the Qilian Mountains as objects. Based on the observation data of rainfall interception

meteorological data and forestland investigation data in the growing season (May to September) of 2019

the rainfall interception process was analyzed

and the rainfall interception process of P. crassifolia forest was simulated by using modified Gash model. The results showed that the total amount of atmospheric rainfall outside the forest during the study period was 418.7 mm

and the rainfall was mainly moderate and light rain. The throughfall

trunk stem flow and canopy interception was 284.5

6.7 and 127.5 mm

respectively

accounting for 67.94%

1.60% and 30.46% of the total atmospheric rainfall

respectively. According to the simulation results of modified Gash model

the corresponding simulated value of throughfall

trunk stem flow and canopy interception was 302.2

3.7 and 112.8 mm

respectively

accounting for 72.18%

0.88% and 26.94% of the total atmospheric rainfall

respectively. Compared with the measured values

the relative errors of the above parameters were 6.22%

44.78% and 11.53%. According to the parameters sensitivity analysis of the modified Gash model

the influence of the parameters on the canopy interception rate during the change process of -50% to 50% followed the order of E > c > R > S > St > Pt. In conclusion

the modified Gash model showed a good fitting effect in the simulation of rainfall interception of P. crassifolia forest in Qilian Mountains. The research results provide references for the research of the water cycle of P. crassifolia forest in Qilian Mountains.

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