Water loss in transit in an intermittent river in brazilian semi-arid

Abstract

Riverwater often comes into contact with the underground flow in aquifers. When this contact
 occurs, the river and aquifer are considered to be hydraulically connected. In recent decades, there has
 been great interest in trying to to improve understanding of the interactions occuring between superficial and
 subterranean water systems. A variety of analytical solutions have been proposed to describe the interaction of
 confined and free aquifers with adjacent rivers, including the quantification of the decrease of river flow along
 its course. The objective of the current study was to calibrate and validate a loss-in-transit flow model for rivers,
 and to evaluate the minimum flow that still permits connectivity between water sources in the Alto Jaguaribe
 basin. The methodology used was based on the equation of continuity and mass balance along the study river.
 A modified Araújo and Ribeiro equation showed strong applicability to loss-in-transit generation, with a mean
 loss in transit of 3.6% km-1, and a Nash and Sutcliffe Efficiency value of 0.29. On the other hand, the classbased
 loss of upstream flow generated 4 classes with a mean of 2.6% km-1 and showed great improvement,
 reaching an NSE of 0.74 - high efficiency. Minimum flows were below the regular flow recorded by the Ceará
 Secretariat of Water Resources, showing that the ability exists in the region hydrological connectivity between
 reservoirs in the Alto Jaguaribe basin and for alluvial aquifers to be recharged.

Evaluation of water loss in transit and surface runoff in a Brazilian semi-arid basin

“…Water loss in transit can be defined as the part of the stream flow or reservoir outflow that does not reach a specified downstream point within a specified time. The determination of loss in transit is of key importance when calculating the flow rate required for hydrological connectivity between river sections (Mvandaba et al, 2018;Toledo et al, 2018). An approach to transit water loss along rivers in semiarid regions has used a continuity equation along the river course.…”