Forward and inverse calculation method for shape and depth of seepage channel of embankment

Seepage diseases in embankments are very common, and if they cannot be treated in time, they will bring serious safety hazards and even cause embankment break accidents. Identifying the location and depth of a seepage channel is the prerequisite and basis for the treatment of seepage diseases. At present, there are several methods are used to detect seepage in embankments, but none of them can accurately calculate or explain the depth of seepage channels. The magnetic gradient tensor method, which is widely used in the depth calculation of magnetic sources, is only suitable for the magnetic dipole model, and not suitable for the tubular model similar to the seepage channel. In view of this, this paper draws on the idea of magnetic exploration, and proposes a forward and inverse calculation method for the depth of the seepage channel. This method first builds a variety of basic seepage channel models based on certain constraints, and calculates the magnetic field value of each model at each measuring point on the ground surface. Then compare the actual measured magnetic field value with the model magnetic field value to find the closest seepage channel model. Finally, by continuously optimizing the closest model, the real seepage channel is gradually approached. The model calculated by this method can better reflect the depth information of the real seepage channel, and the depth error is less than 1m.