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首页> 外文会议>Multidisciplinary Conference >The Hydrologic Function of the Soil and Bedrock System at Upland Sinkholes in the Edwards Aquifer Recharge Zone of South-Central Texas
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The Hydrologic Function of the Soil and Bedrock System at Upland Sinkholes in the Edwards Aquifer Recharge Zone of South-Central Texas

机译：德克萨斯州南部亚富德富载含水层充电区的旱地污水井土壤和基岩系统的水文功能

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Small subtle karst features are ubiquitous in the uplands of the Edwards aquifer recharge zone of south-central Texas. The maintained surface expression of sinkholes, e.g. depressed area, of a number of sinkholes suggests these features are actively undergoing karst processes of soil piping or soil sapping. Much of the urban development around San Antonio and Austin is currently occurring in these upland areas; therefore, it is important to determine the hydrologic function of these features to minimize there potential impact on structures as well as to mitigate water quality concerns. Several artificial recharge experiments were conducted at typical small, soil-lined, upland sinkholes. Artificial recharge experiments using a constant-head ring infiltrometer indicated the infiltration rates at these sinkholes are not significantly higher; but are actually somewhat lower, than control plots. Both rates are within the range of infiltration for the 30% to 40% clay soils in the area. Volumetrically, these features likely recharge more than background due to microtopography. In order to further discover what impacts modification of these features might have on water quality in the Edwards aquifer, several follow-up tests were conducted. Repeat GPR tests were used to determine subsurface geometry of soil and rock and area of wetting distribution. Dyed water was ponded and allowed to infiltrate the features, which were subsequently excavated to determine the distribution of dye in the soil to locate preferential pathways. Once complete, the excavated features were subjected to additional constant head infiltration experiments to determine the infiltration rates of the underlying epikarst. The results of the follow-up experiments were compared with previous experiments to determine epikarst storage and the role soil has on infiltration rates of features with modified soil cover.
机译：小微妙的喀斯特特征在德克萨斯州南部中南部的Edwards Aquifer充电区的高地普遍存在。 Sinkholes的保持表面表达，例如，凹陷区域，许多污水露天表明这些特征是积极接受土壤管道或土壤吸尘的岩溶过程。目前在这些高地地区发生了许多城市发展和圣安东尼奥和奥斯汀的城市发展;因此，重要的是确定这些特征的水文功能，以最大限度地减少对结构的影响以及减轻水质问题。在典型的小型，土壤衬里，旱地下沉孔进行了几个人工充电实验。使用恒定头环渗透计的人工补给实验表明这些污水孔的渗透速率没有明显更高;但实际上比控制图更低。两个率在该地区的30％至40％粘土土壤的渗透范围内。大量地，由于微拷贝，这些特征可能对后部充电。为了进一步了解，在Edwards Aquifer中对这些特征的改变可能对水质进行了改进，进行了几种后续测试。重复GPR测试用于确定土壤和岩石和润湿分布区域的地下几何形状。染色水被浸入并使其渗透到随后挖掘的特征以确定土壤中染料的分布以定位优先途径。一旦完成，挖掘特征就会进行额外的恒定头渗透实验，以确定底层EPikarst的渗透率。将随访实验的结果与先前的实验进行了比较，以确定Epikarst储存，并且角色土壤具有改性土盖的特征渗透速率。

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