  Studying the process of divertor detachment and the associated complex
interplay of plasma dynamics and atomic physics processes is of utmost
importance for future fusion reactors. Whilst simplified analytical models
exist to interpret the general features of detachment, they are limited in
their predictive power, and complex 2D or even 3D codes are generally required
to provide a self-consistent picture of the divertor. As an intermediate step,
1D models of the Scrape-Off Layer (SOL) can be particularly insightful as the
dynamics are greatly simplified, while still self-consistently including
various source and sink terms at play, as well as additional important effects
such as flows. These codes can be used to shed light on the physics at play, to
perform fast parameter scans, or to interpret experiments. In this paper, we
introduce the SPLEND1D (Simulator of PLasma ENabling Detachment in 1D) code: a
fast and versatile 1D SOL model. We present in detail the model that is
implemented in SPLEND1D. We then employ the code to explore various elements of
detachment physics for parameters typical of the Tokamak \`a Configuration
Variable (TCV), including the atomic physics and other processes behind power
and momentum losses, and explore the various hypotheses and free parameters of
the model.
