Impact of Human Activities to Hydrologic Alterations on the Illinois River

摘要: The Illinois River is a tributary of the Mississippi that connects Lake Michigan and River. Starting in 1848 when Canal began to open, has experienced some major human activities such as flow diversion, creation levee drainage districts on floodplains, construction locks dams river. This paper uses Pettitt-Mann-Whitney change-point statistical analysis identify hydrologic change points caused by quantify alterations system. Observed stage data from 12 U.S. Army Corps Engineers gauges observed flows three Geological Survey were used analyze effects hydraulic conditions year 1938 was identified point for low stages 1972 high stages. condition changes due combination added Michigan, district construction, dams, whereas hydroclimatic within basin. Analyses based Indicators Hydrologic Alteration (IHA) have shown magnitudes, frequency, duration, number reversals during flood greatly modified by: (1) completed 1938, (2) reduction diversion (3) around 1972. latter probably contributed loss both soil-moist plants submerged aquatic once provided several important ecosystem services analyses described this paper, coupled with ecological models, can help site selection management plans restoration floodplains regulated rivers. DOI: 10.1061/(ASCE)HE .1943-5584.0000465. © 2012 American Society Civil Engineers.