Cross sections of the Le Sueur and Maple Rivers, Minnesota

A total of 44 cross-sections were surveyed on the Le Sueur and Maple rivers, near Mankato, Minnesota in 2008 and again in 2015. The cross sections were initially measured in 2008 to support development of a watershed sediment budget (Belmont et al., 2011; Gran et al., 2011) and a numerical sediment routing model (Viparelli et al., 2014). The flood of record occurred in 2010, with several other large floods in subsequent years. So the cross-sections were repeated in 2015 in an effort to quantify morphological changes in the channel to inform development of a morphodynamic channel-floodplain model (Call et al., 2017). In each survey, a total of 20 bankfull cross-section surveyed on the Le Sueur River and another 24 cross sections were surveyed on the Maple River.

2008年与2015年，研究团队于明尼苏达州曼卡托附近的勒苏尔河（Le Sueur River）与枫树河（Maple River）流域共完成44处河道断面的勘测工作。2008年开展的初始断面测量，旨在支撑流域泥沙收支（Belmont等，2011；Gran等，2011）与泥沙输运数值模型（Viparelli等，2014）的研发。2010年发生了有记录以来的特大洪水，后续数年亦接连发生多场大型洪水，因此研究团队于2015年对河道断面进行复测，以量化河道地貌形态变化，为地貌动力学河道-漫滩模型（morphodynamic channel-floodplain model）的开发提供数据支撑。在两次勘测中，勒苏尔河均完成20处平滩断面（bankfull cross-section）的测量，枫树河则完成24处河道断面的勘测。