<label for="idselect">{{Années disponibles}}</label>
  <select name="param" id="idselect">
    <option value="">Faites votre choix</option>
    <option value="1947"[(#ENV{[Ancre1947<-]}|=={1947}|?{' selected="selected"',''})]>[Ancre1947<-]</option>
    <option value="2"[(#ENV{param}|=={2}|?{' selected="selected"',''})]>Valeur 2</option>
    <option value="3"[(#ENV{param}|=={3}|?{' selected="selected"',''})]>Valeur 3</option>
    <option value="4"[(#ENV{param}|=={4}|?{' selected="selected"',''})]>Valeur 4</option>
  </select>

<script>
        $('select').change(function(){
            document.location.href = '#' + $(this).find('option:selected').attr('value');
        })
</script>
<select>
    <option value="">Faites votre choix</option>
    <option value="Ancre1940">1940</option>
    <option value="Ancre1941">1941</option>
    <option value="Ancre1947">1947</option>
    etc
</select>

<p id="Ancre1947"></p>
<p id="Ancre1941"></p>
<p id="Ancre1940"></p>

<p class=ancre>[Ancre1941<-]</p>

.ancre {
  position: relative;
  top: -50px;
}