Coupling Soil Erosion and Sediment Transport Processes With the Variable Infiltration Capacity Model (VIC-SED) for Applications Suitable With Coarse Spatial and Temporal Resolutions

IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Xianhong Xie, Xu Liang
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引用次数: 0

Abstract

Understanding soil erosion and sediment transport from the hillslope scale to the regional scale is crucial for studies on water quality, soil-water conservation, the lateral carbon cycle, environmental zoning and vulnerability. However, most existing erosion and sediment transport models are only applicable at the hillslope scale or for small watersheds with fine spatial resolutions (typically much less than 1 km). This study presents a process-based soil erosion and sediment transport model for model applications designed for applications with coarse spatial (e.g., ≥10 km) and temporal (e.g., from hourly to daily) resolutions. This new model, referred to as VIC-SED, effectively accounts for interactions between erosion and hydrological processes. This is achieved by tightly coupling the erosion processes with a hydrologically based Three-layer Variable Infiltration Capacity (VIC-3L) land surface model (LSM) and to a multi-scale routing (MSR) model. VIC-SED considers the impacts of (a) the spatio-temporal variability of rainfall intensity on erosion processes and (b) soil moisture on the soil detachment process. VIC-SED is evaluated in two watersheds. Results demonstrate that VIC-SED is capable of reproducing water and suspended sediment discharges at coarse spatial resolutions and varying temporal scales varying from 15-min to daily intervals. Our study indicates that the VIC-SED model is a promising tool for studying and assessing the impacts of climate and land cover changes on suspended sediment yields over large regions using coarse spatial and temporal resolutions.

Abstract Image

将土壤侵蚀和沉积物迁移过程与可变渗透能力模型(VIC-SED)耦合起来,以满足粗时空分辨率的应用需求
了解从山坡尺度到区域尺度的土壤侵蚀和沉积物迁移对水质、水土保持、横向碳循环、环境分区和脆弱性研究至关重要。然而,大多数现有的侵蚀和沉积物迁移模型仅适用于山坡尺度或空间分辨率较低(通常小于 1 千米)的小流域。本研究提出了一种基于过程的土壤侵蚀和泥沙输运模型,该模型专为粗空间分辨率(如≥10 公里)和时间分辨率(如从每小时到每天)的应用而设计。这一新模型被称为 VIC-SED,可有效解释侵蚀和水文过程之间的相互作用。这是通过将侵蚀过程与基于水文的三层可变渗透能力(VIC-3L)地表模型(LSM)和多尺度路由模型(MSR)紧密耦合来实现的。VIC-SED 考虑了(a)降雨强度的时空变化对侵蚀过程的影响和(b)土壤湿度对土壤剥离过程的影响。在两个流域对 VIC-SED 进行了评估。结果表明,VIC-SED 能够以较高的空间分辨率和不同的时间尺度(从 15 分钟到每天)再现水和悬浮沉积物的排放。我们的研究表明,VIC-SED 模型是一种很有前途的工具,可以利用较高的空间和时间分辨率研究和评估气候和土地覆盖变化对大面积悬浮泥沙产量的影响。
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来源期刊
Journal of Advances in Modeling Earth Systems
Journal of Advances in Modeling Earth Systems METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
11.40
自引率
11.80%
发文量
241
审稿时长
>12 weeks
期刊介绍: The Journal of Advances in Modeling Earth Systems (JAMES) is committed to advancing the science of Earth systems modeling by offering high-quality scientific research through online availability and open access licensing. JAMES invites authors and readers from the international Earth systems modeling community. Open access. Articles are available free of charge for everyone with Internet access to view and download. Formal peer review. Supplemental material, such as code samples, images, and visualizations, is published at no additional charge. No additional charge for color figures. Modest page charges to cover production costs. Articles published in high-quality full text PDF, HTML, and XML. Internal and external reference linking, DOI registration, and forward linking via CrossRef.
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