Spatial patterns of hydrological responses to land use/cover change in a catchment on the Loess Plateau, China

Yan, Rui; Zhang, Xiaoping; Yan, Song Y.; Zhang, Jianjun; Chen, Hao

doi:10.1016/j.ecolind.2017.04.013

Cited by 81 publications

(41 citation statements)

References 38 publications

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“…However, many recent studies have concluded that climate is becoming a secondary driving factor in the reduction of annual streamflow and annual sediment load (P. Gao et al, ; Z. L. Gao et al, ; Wang et al, 2016; J. Zhang et al, ; X. P. Zhang et al, ). In our study catchment, the mean annual precipitation in the flooding season of May to October was 418.9 mm in the first period of 1963–1979, 391.6 mm in the second period of 1980–2002, and 388.5 mm in the third period of 2003–2011 (Yan, Zhang, Yan, Zhang, & Chen, ). Compared with the first period of 1963–1979, the slight decrease of precipitation in the second period of 1980–2002 contributed the reduction of streamflow and sediment yield by 61.2% and 48.6%, respectively.…”

Section: Discussionsupporting

confidence: 92%

“…L. Gao et al, 2012;Wang et al, 2016;. In our study catchment, the mean annual precipitation in the flooding season of May to October was 418.9 mm in the first period of [1963][1964][1965][1966][1967][1968][1969][1970][1971][1972][1973][1974][1975][1976][1977][1978][1979]391.6 mm in the second period of 1980-2002, and 388.5 mm in the third period of 2003-2011 (Yan, Zhang, Yan, Zhang, & Chen, 2017). Compared with the first period of 1963-1979, the slight decrease of precipitation in the second period of 1980-2002 contributed the reduction of streamflow and sediment yield by 61.2% and 48.6%, respectively.…”

Section: Discussionmentioning

confidence: 99%

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Understanding land use and cover change impacts on run‐off and sediment load at flood events on the Loess Plateau, China

Zhang

Lin

Chen

et al. 2018

Hydrological Processes

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The Loess Plateau has been experiencing large‐scale land use and cover changes (LUCCs) over the past 50 years. It is well known about the significant decreasing trend of annual streamflow and sediment load in the catchments in this area. However, how surface run‐off and sediment load behaved in response to LUCC at flood events remained a research question. We investigated 371 flood events from 1963 to 2011 in a typical medium‐sized catchment within the Plateau in order to understand how LUCC affected the surface run‐off generation and sediment load and their behaviours based on the analysis of return periods. The results showed that the mean annual surface run‐off and sediment load from flood events accounted for 49.6% and 91.8% of their mean annual totals. The reduction of surface run‐off and associated sediment yield in floods explained about 85.0% and 89.2% of declines in the total annual streamflow and sediment load, respectively. The occurrences of flood events and peak sediment concentrations greater than 500 kg/m3 showed a significantly downward trend, yet the counterclockwise loop events still dominated the flood event processes in the catchment. The results suggest that LUCC over the past 50 years resulted in significant changes in the water balance components and associated soil erosion and sediment transportation in the catchment. This was achieved mainly by reducing surface run‐off and sediment yield during floods with return period of less than 5 years. Run‐off–sediment load behaviour during the extreme events with greater than 10‐year return periods has not changed. Outcomes from this study are useful in understanding the eco‐hydrological processes and assisting the sustainable catchment management and land use planning on the Loess Plateau, and the methodologies are general and applicable to similar areas worldwide.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Understanding land use and cover change impacts on run‐off and sediment load at flood events on the Loess Plateau, China

Zhang

Lin

Chen

et al. 2018

Hydrological Processes

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“…Variable selection was based on data availability and major drivers of environmental degradation in the study area. Data on the following variables were collected: Watershed morphometric (WM) parameters related to geometry, drainage network, and relief (see Table ) that are closely related to surface runoff and soil erodibility, particularly in lands with rugged topography (Blanco‐Canqui and Lal ). Land use/land cover (LULC) as a factor of influence on water availability and hydrological processes (Sriwongsitanon and Taesombat ; Dwarakish and Ganasri ; Yan et al ). Vegetation cover was included as it regulates soil erosion rates and sediment transport (Gellis et al ; Leh et al ; Abdulkareem et al ). Soil erosion risk (SER) as a descriptor of the soil resistance or vulnerability to water and wind erosion (Blanco‐Canqui and Lal ). Population distribution (PD) as the main driver of degradation of natural resources.…”

Section: Methodsmentioning

confidence: 99%

Identification of Priority Areas for Integrated Management of Semiarid Watersheds in the Ecuadorian Andes

Arteaga¹,

Ochoa²,

Fries

et al. 2020

J American Water Resour Assoc

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Research Impact Statement: Methodology to prioritize areas of soil and water management and conservation in basins. A decision-making tool for the implementation of targets 6.6, 15.1-15.2 of the Sustainable Development Goals.ABSTRACT: Integrated watershed management (IWM) is a priority, especially in semiarid regions that are concurrently affected by population growth, land use change, soil erosion, and poor governance. In developing countries, IWM is often done without any support tool, scientific data, or deep knowledge of territory characteristics. The aim of this study was to present a case study to apply a decision support tool to prioritize areas for territory management. A simple, quantitative multi-criteria analysis was applied in a semiarid basin of the Ecuadorian Andes to identify the zones of greatest concern for implementation of resource conservation and management practices at a local and regional scale. In addition to describing the current state of the conditions of this basin, our results suggest scenarios of change in relation to official population projections based on spatial analysis of land use change. Analysis resulted in a scattered distribution of priority values within the watershed, so a hierarchical rule was incorporated to define priorities at the subwatershed (SW) scale. Our analysis identified four SW of very high priority and urgent need to implement management practices. Based on projections of future change due to population growth and land cover change, the number of subbasins that require more attention was doubled. Finally, this study includes zones for management or conservation of the land, according to the Sustainable Development Goals.(KEYWORDS: decision support systems -DSS; integrated watershed management -IWM; SDGs; spatial modeling; semiarid basins.)Paper No. JAWRA-18-0106-P of the

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“…Pokhrel et al [22] conducted a review of the integrated effects of changing climate, land use, and dams on Mekong River hydrology. In China's Loess Plateau, there are also many similar studies for the basins with the loess hill and gully landform [23][24][25][26][27]. It was found that increasing vegetation coverage was the primary factor driving the significant reduction in sediment load from the 1960s in some basins in the Loess Plateau (e.g., [23]), and more evapotranspiration and less surface runoff and soil water content were produced than before [24].…”

Section: Introductionmentioning

confidence: 94%

Streamflow and Sediment Declines in a Loess Hill and Gully Landform Basin Due to Climate Variability and Anthropogenic Activities

Chang

Zhang

et al. 2019

Water

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Streamflow and sediment runoff are important indicators for the changes in hydrological processes. In the context of environmental changes, decreases in both streamflow and sediment (especially in the flood season) are often observed in most of the tributaries of the middle Yellow River in China’s Loess Plateau. Understanding the effect of human activities could be useful for the management of soil and water conservation (SWC) and new constructions. In this paper, changes in streamflow and sediment during the flood season (June–September) of the 1966–2017 period in a typical loess hill and gully landform basin were analyzed. Basin-wide rainfall of the flood season decreased nonsignificantly with an average rate of −0.6 mm/flood season for the whole study period by using the trend-free pre-whitening based Mann–Kendall trend test, while the decreasing rate was weakened on the time scale. A remarkable warming trend (1985–1999) and two decreasing trends (1966–1984 and 2000–2017) were observed, and the overall increasing trend could be found in air temperature series with a rate of 0.01 °C/flood season during the study period. Statistical models were developed to describe the rainfall-runoff and rainfall-sediment processes in the pre-impact period (when the hydrological series was stationary). Furthermore, the relative effects of climate variability and human activities on hydrological changes were quantified. Results proved the dominant role of human activities (versus climate variability) on the reductions of both streamflow and sediment load. The relative contribution of human activities to streamflow decrease was 84.6% during the post-impact period 1995–2017, while the contributions were 48.8% and 80.1% for two post-impact periods (1982–1996 and 1997–2017), respectively, to the reduction of sediment load. Besides, the effect of the exclusion of anomalous streamflow or sediment events on change-point detection was also analyzed. It indicated that the anomalous events affect the detection of change points and should be given full consideration in order to decide whether to remove them in the change-point detection. Otherwise, the full series with anomalous samples will completely affect the attribution results of hydrological changes. We also suggest that large-scale SWC measures with different construction quality and operational life could intercept and relieve most floods and high sediment concentration processes, but may amplify the peaks of streamflow and sediment when the interception capacities are exceeded under the condition of extreme rainstorm events.

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Spatial patterns of hydrological responses to land use/cover change in a catchment on the Loess Plateau, China

Cited by 81 publications

References 38 publications

Understanding land use and cover change impacts on run‐off and sediment load at flood events on the Loess Plateau, China

Understanding land use and cover change impacts on run‐off and sediment load at flood events on the Loess Plateau, China

Identification of Priority Areas for Integrated Management of Semiarid Watersheds in the Ecuadorian Andes

Streamflow and Sediment Declines in a Loess Hill and Gully Landform Basin Due to Climate Variability and Anthropogenic Activities

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