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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Surface and profile soil moisture spatio-temporal analysis during an excessive rainfall period in the Southern Great Plains, USA.
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Surface and profile soil moisture spatio-temporal analysis during an excessive rainfall period in the Southern Great Plains, USA.

机译：美国南部大平原过度降雨期间的表层和剖面土壤水分时空分析。

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In this work we analyze the temporal stability of soil moisture at the field and watershed scales in the Little Washita River Experimental Watershed (LWREW), as part of the remote sensing Cloud and Land Surface Interaction Campaign (CLASIC07) during June 2007 in south-central Oklahoma. Temporal stability of surface and profile soil moisture data were investigated for 20 LWREW soil moisture measurement stations. In addition, daily surface and profile soil moisture measurements were obtained in four 800 m by 800 m fields (remote sensing footprint), including two rangeland sites and two winter wheat fields. The work aimed to analyze the temporal stability of soil moisture at the watershed and field scale and to identify stations within the watershed, as well as locations within each field, that were representative of the mean areal soil moisture content. We also determined the relationship between sites found to be temporally stable for surface soil moisture versus those determined stable for average profile soil moisture content. For the unusually wet experimental period, results at the watershed scale show that LWREW stations 133 and 134 provided stable underestimates, while stations 132 and 154 provided stable overestimates of the watershed mean at all depths. In addition, station 136 had very high non-zero temporal stability at the 25 cm and 45 cm depths indicating that it could be used as representative watershed site provided a constant offset value is used to acquire a watershed mean soil water content value. In general, the deeper depths exhibited higher soil moisture spatial variability, as indicated by the higher standard deviations. At the field scale, measured average profile soil moisture was higher in the winter wheat fields than the rangeland fields with the majority of the winter wheat depth intervals having high non-zero temporal stability. Field scale temporal stability analysis revealed that 4 of the 16 sampling sites in the rangeland fields and 3 of the 16 sampling sites in the winter wheat fields either under or overestimated the field means in the 0-5 and 0-60 cm depth intervals. Field sites considered temporally stable for the surface soil moisture were not stable for the profile soil moisture, except for the LW45 field where two sites were stable at both the surface and profile soil moisture. This finding is significant in terms of soil moisture ground-truth sampling for calibrating and validating airborne remotely sensed soil moisture products under extremely wet conditions. In addition, identification of temporally stable sites at the watershed and field scales in the LWREW provide insight in determining future measurement station locations and field scale ground sampling protocol, as well as providing data sets for hydrologic modeling.
机译：在这项工作中，我们分析了小Wash田河实验流域（LWREW）的田间和流域尺度上土壤水分的时间稳定性，这是2007年6月在中南部进行的遥感云与土地表面相互作用运动（CLASIC07）的一部分俄克拉荷马州。研究了20个LWREW土壤水分测量站的表面和剖面土壤水分数据的时间稳定性。此外，在四个800 m x 800 m的田地（遥感足迹）中，包括两个牧场地和两个冬麦田，获得了每天的表面和剖面土壤水分测量值。这项工作旨在分析流域和田间尺度上土壤水分的时间稳定性，并确定流域内的站点以及每个田间的位置，这些站点代表了平均面积土壤含水量。我们还确定了对于表层土壤水分在时间上稳定的站点与对平均剖面土壤水分含量确定的站点之间的关系。对于异常潮湿的实验期，分水岭规模的结果表明，LWREW站133和134提供了稳定的低估，而站132和154提供了所有深度处的分水岭平均值的稳定高估。此外，测站136在25厘米和45厘米深度处具有非常高的非零时间稳定性，表明只要使用恒定的偏移值来获取分水岭的平均土壤含水量，它就可以用作代表性的分水岭。通常，较深的深度表现出较高的土壤水分空间变异性，如较高的标准偏差所表明。在田间尺度上，冬小麦田中测得的平均剖面土壤水分高于牧场田地，大部分冬小麦深度区间具有较高的非零时间稳定性。田间尺度的时间稳定性分析显示，牧场地中的16个采样点中的4个和冬小麦田中的16个采样点中的3个在0-5和0-60 cm深度间隔内均低于或高估了田间平均值。被认为对表层土壤水分暂时稳定的田间场地对于剖面土壤水分不是稳定的，除了LW45田地，其中两个场地在表层土壤水分和剖面土壤水分均稳定。这一发现对于在极端潮湿条件下用于校准和验证机载遥感土壤水分产品的土壤水分地面采样是非常重要的。此外，在LWREW中在流域和田间尺度上确定时间稳定的地点，可为确定未来的测量站位置和田间尺度的地面采样协议提供见识，并为水文建模提供数据集。

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