Spatio-temporal variability in remotely sensed surface soil moisture and its relationship with precipitation and evapotranspiration during the growing season in the Loess Plateau, China

2013 ◽  
Vol 71 (4) ◽  
pp. 1809-1820 ◽  
Author(s):  
Xiaoying Li ◽  
Lichen Liu ◽  
Zhenghu Duan ◽  
Na Wang
Keyword(s):  
Soil Moisture ◽  
Loess Plateau ◽  
Temporal Variability ◽  
Surface Soil ◽  
Growing Season ◽  
Remotely Sensed ◽  
Surface Soil Moisture ◽  
The Loess Plateau ◽  
Spatio Temporal

scholarly journals Temporal stability of surface soil moisture of different vegetation types in the Loess Plateau of China

CATENA ◽  
2015 ◽  
Vol 128 ◽  
pp. 1-15 ◽  
Author(s):  
Ji Zhou ◽  
Bojie Fu ◽  
Guangyao Gao ◽  
Nan Lü ◽  
Yihe Lü ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Loess Plateau ◽  
Surface Soil ◽  
Temporal Stability ◽  
Vegetation Types ◽  
Surface Soil Moisture ◽  
The Loess Plateau

scholarly journals How effective is information on soil-landscape units for determining spatio-temporal variability of near-surface soil moisture?

2018 ◽  
Vol 49 (3) ◽  
pp. 174-182 ◽  
Author(s):  
Paolo Nasta ◽  
Benedetto Sica ◽  
Caterina Mazzitelli ◽  
Paola Di Fiore ◽  
Ugo Lazzaro ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Temporal Variability ◽  
Surface Soil ◽  
Controlling Factors ◽  
Surface Soil Moisture ◽  
Near Surface ◽  
Soil Landscape ◽  
Spatio Temporal ◽  
Landscape Units ◽  
Mapping Units

In the last decades, a growing interest in fostering advanced interdisciplinary studies is leading to the establishment of observatories in pilot catchments for long-term monitoring of hydrological variables and fluxes. Nevertheless prior to sensor network installation, this investment necessitates preliminary surveys on key-variables such as near-surface soil moisture in order to prevent risks of erronously distributing sensors by missing sufficient spatial information for understanding hydrological processes within the landatmosphere interactions. The availability of maps describing areas with similar morphological, topographical, soil, and vegetation characteristics enable preliminary surveys to be organized for capturing spatio-temporal variability of soil moisture as best as possible. The soil-landscape classification can be considered as an interesting approach for grouping mapping units with similar hydrological behavior. Therefore, we assume the soil-landscape units as hydrotopes or hydrological similar units. Six transects were established along two hillsides of the Upper Alento River catchment (southern Italy) which is a proper candidate to become a Critical Zone Observatory. In this paper we use a soil-landscape map to infer spatial and temporal dynamics of soil moisture measured along these transects, whereas quantitative analyses were obtained by using multivariate techniques. The effectiveness of available information on soil-landscape mapping units is evaluated with respect to different observed patterns of soil moisture: wetter- and drier-than average observation points belong to agricultural and forested hillslopes, respectively. Soil texture and topographical controlling factors, especially clay content and slope gradient, are found to explain approximately 70% of the observed spatial variations in soil moisture along the forested hillslopes. The spatial structure explained by the environmental controlling factors decreases to 45% in the cases of the agricultural hillslopes mainly due to perturbations induced by grazing and tillage practices.

scholarly journals Assessment of Remotely Sensed Near-Surface Soil Moisture for Distributed Eco-Hydrological Model Implementation

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2613 ◽  
Author(s):  
Carlos Echeverría ◽  
Guiomar Ruiz-Pérez ◽  
Cristina Puertes ◽  
Luis Samaniego ◽  
Brian Barrett ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Surface Soil ◽  
Remotely Sensed ◽  
Validation Period ◽  
Surface Soil Moisture ◽  
Area Index ◽  
Spatio Temporal ◽  
Calibration Approach

The aim of this study was to implement an eco-hydrological distributed model using only remotely sensed information (soil moisture and leaf area index) during the calibration phase. Four soil moisture-based metrics were assessed, and the best alternative was chosen, which was a metric based on the similarity between the principal components that explained at least 95% of the soil moisture variation and the Nash-Sutcliffe Efficiency (NSE) index between simulated and observed surface soil moisture. The selected alternative was compared with a streamflow-based calibration approach. The results showed that the streamflow-based calibration approach, even presenting satisfactory results in the calibration period (NSE = 0.91), performed poorly in the validation period (NSE = 0.47) and Leaf Area Index (LAI) and soil moisture were neither sensitive to the spatio-temporal pattern nor to the spatial correlation in both calibration and validation periods. Hence, the selected soil moisture-based approach showed an acceptable performance in terms of discharges, presenting a negligible decrease in the validation period (ΔNSE = 0.1) and greater sensitivity to the spatio-temporal variables’ spatial representation.

Impact of revegetation of the Loess Plateau of China on the regional growing season water balance

2020 ◽  
Author(s):  
Weidong Guo ◽  
Andrew Pitman ◽  
Jun Ge ◽  
Beilei Zan ◽  
Congbin Fu
Keyword(s):  
Soil Moisture ◽  
Loess Plateau ◽  
Wrf Model ◽  
Growing Season ◽  
Weather Research And Forecasting ◽  
The Loess Plateau ◽  
Deep Soil ◽  
Bare Land ◽  
Biophysical Changes ◽  
The Impact

<p>To resolve a series of ecological and environmental problems over the Loess Plateau, the was initiated at the end of 1990s. Following the conversion of croplands and bare land on hillslopes to forests, the Loess Plateau has displayed a significant greening trend with soil erosion being reduced. However, the GFGP has also affected the hydrology of the Loess Plateau which has raised questions whether the GFGP should be continued in the future. We investigated the impact of revegetation on the hydrology of the Loess Plateau using high resolution simulations and multiple realisations with the Weather Research and Forecasting (WRF) model. Results suggests that land cover change since the launch of the GFGP has reduced runoff and soil moisture due to enhanced evapotranspiration. Further revegetation associated with the GFGP policy is likely to increase evapotranspiration further, and thereby reduce runoff and soil moisture. The increase in evapotranspiration is associated with biophysical changes, including deeper roots that deplete deep soil moisture stores. However, despite the increase in evapotranspiration our results show no impact on rainfall. Our study cautions against further revegetation over the Loess Plateau given the reduction in water available for agriculture and human settlements, without any significant compensation from rainfall.</p>

The value of remotely sensed surface soil moisture for model calibration using SWAT

2017 ◽  
Vol 31 (15) ◽  
pp. 2764-2780 ◽  
Author(s):  
Dipangkar Kundu ◽  
R. Willem Vervoort ◽  
Floris F. van Ogtrop
Keyword(s):  
Soil Moisture ◽  
Model Calibration ◽  
Surface Soil ◽  
Remotely Sensed ◽  
Surface Soil Moisture
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