Effects of DEM Resolution on Hydrological Connectivity Index of Small Watershed in Intensive Sugarcane Area

Kang Zhenwei; Ming Xue; Huang Zhigang

doi:10.13961/j.cnki.stbctb.2022.01.027

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Effects of DEM Resolution on Hydrological Connectivity Index of Small Watershed in Intensive Sugarcane Area

- Effects of DEM Resolution on Hydrological Connectivity Index of Small Watershed in Intensive Sugarcane Area
- Bulletin of Soiland Water Conservation Vol. 42, Issue 1, Pages: 198-207(2022)
- 作者机构：
  
  广西大学农学院,广西,南宁,530004
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2022.01.027
  CLC： P333;S126
- Published：2022
- 稿件说明：
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Kang Zhenwei, Ming Xue, Huang Zhigang. Effects of DEM Resolution on Hydrological Connectivity Index of Small Watershed in Intensive Sugarcane Area[J]. Bulletin of Soiland Water Conservation, 2022, 42(1): 198-207.
DOI：

Kang Zhenwei, Ming Xue, Huang Zhigang. Effects of DEM Resolution on Hydrological Connectivity Index of Small Watershed in Intensive Sugarcane Area[J]. Bulletin of Soiland Water Conservation, 2022, 42(1): 198-207. DOI： 10.13961/j.cnki.stbctb.2022.01.027.

摘要

[目的

]

探究集约化蔗区小流域地表微地形特征参数与水文连通性指数随DEM不同分辨率的变化以及水文连通性指数的最佳DEM分辨率，为后续水文连通性相关研究、农业面源污染及土壤侵蚀等研究提供理论依据与参考。[方法

]

基于ArcGIS与无人机高分辨率影像，利用分区统计等方法，以中国南方集约化蔗区小流域为例，研究了DEM不同分辨率(分别为0.05，0.1，0.2，0.5，1，2，5 m)对地表微地形特征参数(坡度、坡长、表面粗糙度和地表粗糙度)以及水文连通性指数IC(index of hydrological connectivity)的影响。[结果

]

①随着像元尺寸(5~0.05 m)的减小，平均坡度(S)、平均表面粗糙度(S

)分别增加了29.13%与1.62%，平均地表粗糙度SDE与平均坡长因子L分别减少了98.72%与72.09%。新植甘蔗、宿根甘蔗、甘蔗西瓜间作、桉树的平均坡度(S)呈增加趋势，坡长因子(L)呈减小趋势、表面粗糙度(S

)先减小(5~1 m)后增大(1~0.05 m)，地表粗糙度SDE均呈减小趋势，道路的坡度(S)与表面粗糙度(S

)均先减小(5~1 m)后增大(1~0.05 m)，河道的坡长因子先增加(5~2 m)后减小(2~0.05 m)。②水文连通性指数IC均值表现为先增加(5~0.2 m)后减小(0.2~0.05 m)，不同土地利用类型的IC均值差异在0.5 m时达到最大(34.72%)，0.1 m分辨率下IC均值排序为：河道>新植甘蔗>甘蔗西瓜间作>宿根甘蔗>道路>桉树。③桉树、道路、河道最佳DEM分辨率为0.5 m，新植甘蔗、宿根甘蔗、甘蔗西瓜间作最佳DEM分辨率为0.1 m，集约化蔗区小流域最佳DEM分辨率为0.1 m。[结论

]

DEM分辨率显著影响IC值大小与地表微地形特征参数，且不同土地利用类型所受影响不同。0.1 m是集约化蔗区小流域水文连通性及地表微地形表征的最佳DEM分辨率。

Abstract

[Objective] The response of surface microtopography characteristic index

and hydrological connectivity (IC) index to different resolutions of digital elevation model (DEM) was studied

and the best DEM resolution of IC was determined in a small watershed of an intensive sugarcane production area in order to provide a theoretical basis and reference for subsequent research on hydrological connectivity

agricultural non-point source pollution

and soil erosion. [Methods] The effects of different resolutions of DEM (0.05

0.1

0.2

0.5

and 5 m) on surface microtopography characteristics 〔slope (S)

slope length (L)

surface roughness (SR)

standard deviation of elevation (SDE)

and IC〕 were studied in an intensive sugarcane planting area in Southern China using ArcGIS and high-resolution images from an unmanned aerial vehicle (UAV). [Results] ① A decrease in pixel size (5—0.05 m) increased mean S and SR by 29.13% and 1.62%

respectively

but decreased mean SDE and L by 98.72% and 72.09%

respectively. The decreased resolution increased the mean S of newly planted sugarcane

perennial sugarcane

newly planted sugarcane+watermelon

and Eucalyptus

but decreased their L. In contrast

their SR first decreased at 5—1 m and then increased at 1—0.05 m

while SDE decreased generally. However

the S and SR of the road decreased first at 5—1 m and then increased at 1—0.05 m

while L of the river increased first at 5—2 m

and thereafter decreased at 2—0.05 m. ② Mean IC increased first at 5—0.2 m

and then decreased at 0.2—0.05 m. The difference in mean IC of different land use types reached its maximum value (34.72%) at 0.5 m. At 0.1 m resolution

IC followed the order of river>newly planted sugarcane>newly planted sugarcane+watermelon>perennial sugarcane>road>Eucalyptus. The best DEM resolution for Eucalyptus

roads

and rivers was 0.5 m

while 0.1 m resolution was best suited for newly planted sugarcane

perennial sugarcane

and newly planted sugarcane+watermelon. ③ The best DEM resolution for a small watershed in an intensive sugarcane area was 0.1 m. [Conclusion] DEM resolution had a significant effect on IC and index of surface microtopography characteristics

with varied effects for different land use types. The optimal DEM resolution of 0.1 m was best suitable for the characterization of a small watershed in an intensive sugarcane area.

关键词

Keywords

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