Runoff response of a small agricultural basin in the argentine Pampas considering connectivity aspects,Hydrological Processes

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Runoff response of a small agricultural basin in the argentine Pampas considering connectivity aspects
Hydrological Processes ( IF 2.8 ) Pub Date : 2020-05-24 , DOI: 10.1002/hyp.13782
María Guadalupe Ares _{1,

2,

3} , Marcelo Varni ₂ , Celio Chagas ₄

Affiliation

Our manuscript analyses the surface runoff variability, and its controlling factors in a small basin with gentle slopes, at the headwaters of a flat catchment, to improve the knowledge of the hydrology of plain areas under agriculture. We study runoff, rainfall and antecedent conditions in the argentine Pampas region. We use correlations, regressions and quantitative and qualitative descriptive information of the system: erosion signs, ground cover by crops, groundwater depth data and temporal changes in the drainage network, to discuss and understand the complexity of the runoff process by frameworks to study (dis)connectivity. The analysis of 56 events evidenced a nonlinear rainfall–runoff relationship. In contrast with other works, we identified clear upper limit events, under which hydrological responses emerge, as a result of combinations of antecedent wetness, rainfall erosivity, ground cover and preferential drainage paths. We separated the nonlinear rainfall–runoff response in three linear relationships according to differences in antecedent wetness conditions. We found differences in runoff responses under wet and dry antecedent conditions, but complex responses under medium antecedent conditions. The analyses of the inputs, the structural and the functional elements of the (dis)connectivity frameworks, were key in the understanding of the temporal changes of runoff, and its complex responses. Temporal coincidences of connectivity components and their feedbacks appear to be strongly associated with the runoff dynamics. High‐magnitude hydrological responses occur with complete coincidences, while partial coincidences between the components reduce connectivity and low magnitude and/or heterogeneous responses prevail. Thus, these analyses suggest that runoff is controlled by (dis)connectivity in this basin with gentle slopes. Our work contributes to the understanding of the process of surface runoff in the context of humid flatlands under agricultural land use, by the identification of the complex combinations of factors which regulate/control the (dis)connectivity that helps to interpret the nonlinearities of runoff.

中文翻译：

考虑连通性方面的阿根廷潘帕斯州一个小型农业流域的径流响应

我们的手稿分析了平坦集水区上游的平缓小流域地表径流的变化及其控制因素，以提高对农业平原地区水文学的认识。我们研究了阿根廷潘帕斯地区的径流，降雨和前期条件。我们使用系统的相关性，回归以及定量和定性的描述性信息：侵蚀迹象，农作物的地被植物，地下水深度数据和排水网络的时间变化，通过研究框架来讨论和理解径流过程的复杂性（diss ）的连通性。对56个事件的分析表明，降雨与径流之间存在非线性关系。与其他工作相比，我们确定了明显的上限事件，在这些事件下出现了水文响应，由于先前的湿度，降雨侵蚀力，地面覆盖和优先排水路径的组合。根据前期湿度条件的差异，我们将非线性降雨-径流响应分为三个线性关系。我们发现在干湿条件下的径流响应存在差异，但在中湿条件下的径流响应复杂。对输入，连通性框架的结构和功能要素的分析对于理解径流的时间变化及其复杂响应至关重要。连接性要素及其反馈的时间巧合似乎与径流动力学密切相关。高强度水文响应是完全重合的，组件之间的部分重合会降低连接性，并且幅度较小和/或异构响应占主导。因此，这些分析表明，该流域由坡度平缓的（非连通性）控制径流。通过确定调节/控制（非）连通性的因素的复杂组合，有助于解释径流的非线性，我们的工作有助于理解湿润平地在农业土地利用下的地表径流过程。

更新日期：2020-05-24

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