Finding Principles of Large Scale Hydrologic Response: Linking Hydroclimatology and River Basin Dynamics

提出的研究目标是通过耦合水文气候学和流域动力学来发展不同水文气候条件下大尺度水文响应的原理。通过对大气-水文循环和径流的联合分析，建立水文气候学和流域响应特征的参数化。在这项任务中，我们将：(1)结合大气动力学、大气湿度、风速和温度场分析以及径流观测，将整个美国划分为均匀的水文气候制度。这还涉及识别描述这些制度之间的异同的参数。发展表征每一均质状态下气候学特征的参数与流域反应之间的关系。发展大规模流域响应的无量纲公式，明确地将水文气候学影响和三维河网的自相似性纳入其中。在这项任务中，我们将(1)将水文气候影响和三维河网的自相似性纳入水文相似性的概念，并在非维度框架中开发流域响应的公式。（ii）分别确定控制水文气候均质制度内和跨水文气候均质制度的两个流域响应的相似性和差异性的重要参数，并利用高分辨率数字高程和流量数据检查其适用性的尺度，在不同的水文气候制度中进行验证研究。在这项任务中，我们将：(i)将上述公式生成的流域响应与不同制度下观测到的流量进行比较。通过使用不同大小的流域，研究无量纲公式的适用性尺度；分析已确定的参数的有效性，这些参数表征同质制度内反应之间的相似性和它们之间的差异。在提议期间，模型开发和试验将限于两到三个相同制度的盆地。

Kumar The objective of the proposed research is to develop principles of large scale hydrologic response in different hydroclimatological regimes by coupling hydroclimatology and river basin dynamics. This objective will be accomplished via three tasks: Through joint analysis of the atmospheric-hydrologic cycle and streamflow develop parameterizations to link hydroclimatology and basin response characteristics. In this task we will: (I) Classify the entire US into homogeneous hydroclimatic regimes using a combination of atmospheric dynamics, and analysis of atmospheric moisture, wind velocity and temperature fields, and stramflow observations. This also involves identifying parameters that describe the similarities and differences between these regimes. (ii) Develop relationships between parameters characterizing the climatology and the basin response in each homogeneous regime. Develop a non-dimensional formulation of large-scale basin response which explicitly incorporates the hydrolimatological influence and self-similarity of the three dimensional river networks. In this task we will (I) Incorporate hydroclimatological influence and the self-similarity of three dimensional river networks into the notion of hydrologic similarity and develop formulation of basin response in non-dimensional framework. (ii) Identify the important parameters that control the similarities and differences in responses of two basins within and across hydroclimatogically homogeneous regimes, respectively, and examine the scales of their applicability Using high resolution digital elevation and streamflow data, perform validation studies in different hydrolimatic regimes.In this task we will: (i) Compare the basin response generated from the above formulations with the observed streamflows in the different regimes . (ii) Study the scales of applicability of the non-dimensional formulations by using basins of various sizes (iii) Analyze the effectiveness of the identified parameters that characterize the similarities between responses within homogeneous regimes and differences across them. Model development and testing will be limited to basins in two to three homogeneous regimes for the duration of the proposal.