subsection

<section id="s1-1" type="body">

<subsection level="1" id="ss2">

<;heading id="h2" level="1">Introduction</heading>

<p>The transport of sand and dust by wind is a major mechanism contributing to
 landform change in environments conducive to aeolian activity……………..</p>

</subsection>

<subsection level="1" id="ss3">

<heading id="h3" level="1">Study site and methods</heading>

</subsection>

<subsection level="2" id="ss4">

<heading id="h4" level="2">Study site</heading>

<p>The field experiments were conducted in the Oceano Dunes State Vehicular
 Recreation Area (SVRA) on the central California coast…………..</p>

</subsection>

<subsection level="2" id="ss5">

<heading id="h5" level="2">Instrument deployment</heading>

<p>Instruments for monitoring the wind field and aeolian mass flux were installed
 along a shore-parallel transect ≈ 12 m………….</p></subsection>

<subsection level="2" id="ss6">

<heading id="h6" level="2">Numerical modelling</heading>

<p>Most numerical models of saltation ………….d.</p>

</subsection>

<subsection level="3" id="ss7">

<heading id="h7" level="3">Trajectory calculations</heading>

<p>The trajectories followed by saltating grains are specified using standard
 relations…………...</p></subsection>

<subsection level="3" id="ss8">

<heading id="h8" level="3">Wind speed profile</heading>

<p>In order to solve………..</p>

</subsection>

<subsection level="3" id="ss9">

<heading id="h9" level="3">Grain–bed collision</heading>

<p>The grain–bed collision……………..</p>

</subsection>

<subsection level="1" id="ss10">

<heading id="h10" level="1">Results</heading>

<p>A total of nine data runs ………….</p>

</subsection>

</section>