Luquillo biocomplexity meeting january 2004
Download
1 / 32

Luquillo Biocomplexity Meeting January 2004 - PowerPoint PPT Presentation


  • 90 Views
  • Uploaded on
  • Presentation posted in: General

Luquillo Biocomplexity Meeting January 2004. Hydrology overview Stream-Hydrology issues Pike/Scatena research plan. Steep Environmental Gradients Subtropical Dry (1200 mm/yr) to Wet (5000mm/yr) Windward vs leeward. Hydrology Overview. Steep Environmental Gradients

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha

Download Presentation

Luquillo Biocomplexity Meeting January 2004

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Luquillo Biocomplexity Meeting January 2004

  • Hydrology overview

  • Stream-Hydrology issues

  • Pike/Scatena research plan


  • Steep Environmental Gradients

  • Subtropical Dry (1200 mm/yr) to Wet (5000mm/yr)

  • Windward vs leeward


Hydrology Overview

  • Steep Environmental Gradients

  • Maritime climate with high rainfall frequency minor seasonality

    • 3 rain showers/day, High interception,

    • Intense rainfalls; >500 mm/day, 125 mm/day threshold; Hurricanes, TS, northern fronts

  • Dynamic disturbance regime

    • Hurricanes, landslides, tree-falls

    • Old on inside-young on outside


Seasonality of Luquillo Climate

May

Rains


Forest Wide Temperature

Based on regression of Temp vs elevation, aspect


Wet Season

Dry Season


Hydrology Overview

  • Steep Environmental Gradients

  • Maritime climate with high rainfall frequency minor seasonality

  • Dynamic disturbance regime

    • Hurricanes, landslides, tree-falls

    • “Old on inside-young on outside”


Hillslope processes

  • Deep Clayey soils; 6 + m of saprolite

    • Volcanoclastics vs Grandiorite

  • Hillslope Catena’s

  • Shallow flow paths; < 1 m

    • through-flow vs overland flow

    • soil compaction, trail erosion

  • Landslides; 1000-2000 yr turnover

    • roads, elevation, bedrock

    • Larsen, Zarin, Walker


Bisley Hillslope profile

Soil and saprolite 10-20 m thick

Storage; at 1% water content = 100-200 mm; 1 month throughfall


Clay and saprolite subsoil with relatively low ksat = low recharge


Storm hydrographs

H20

Na, Mg

Ca, CL


Stream Channel Hydrology

  • Headwaters

    • Steep gradient, boulders, structural control

    • Supply limited

    • “clean water”

  • Coastal plain

    • Alluvial and channelized

    • Relatively stable planform morphology

    • Aggradation/degradation cycle


Annual 7 day

Minimum

Q90

Q50

Xiphocaris spp. Night

Atya spp. Night


Daily Discharge Series

No Extraction

Extraction = Q95, No Minimum In-stream Flow

Extraction = Q95, Minimum In-stream Flow = Q99


General Hydrologic/land use issues

  • Municipal water withdrawal

    • aquatic migrations

  • Urbanization

  • Reservoir sedimentation

    • USGS, landslides

  • Coastal Plain deforestation

    • RAMS model


Regional-scale changes

Synoptic

Systems

Tradewinds

Energy &

Moisture

Land-Sea

Tectonic

Uplift

Sea

Level


On-going research efforts

  • GIS based-statistical models

    • Garcia; low flow prediction, Rivera; peak discharges, Santos; island wide water chemistry

  • Simulation models

    • Hall SUNY-ESF; Soil carbon, ET

  • Interception and cloud forest hydrology

    • Free University of Amsterdam

  • Stream water chemistry, N cycling

    • W. McDowell, UNH

  • Instream flows and water withdrawals

    • Pringle UGA


Roads

Communication

Facilities

Water

Intakes

Roads &

Maintenance

Buildings


Stream/road issuesHydrologic issues

  • Freeze-thaw

  • Groundwater discharge

  • Flooding

    • overbank, diversion flooding

  • Erosion of unpaved roads

  • Damage to bridges and culverts

  • Landslides


  • Stream/Road-Chemical issues

    • Applied chemicals (e.g. road salt..)

      • minor herbicide use

    • Road material

      • asphalt, dirt

    • Emissions

      • Odum Co2

      • Chemical spills

    • Swimming


    Social considerations

    • Social significance of Luquillo Streams

    • Seasonality of recreation

      • locals vs snowbirds

      • don’t go to beach in months with “R”

    • Short travel distances and short storms

    • Shystostomisis and “dirty” streams

    • Swimming skills


    Current Biocomplexity Efforts


    Channel morphology-aquatic habitat

    • GIS-Statistical based approach

      • Develop null then evaluate road crossings

    • Work Plan

      • Aug 2003; channel cross-sections

      • Fall 03; GIS layers

      • Jan 2004; pebble counts

      • Spring 04; develop manuscript I

      • Summer 04; Espirtu Santo, bridges

      • 2005; bridge habitat analysis, water falls…


    Slope Raster


    Channel slope vs Drainage area

    Sonodora= 2.6 km2

    Puente Roto = 17.8 km2

    Mameyes at RT3 = 34.7 km2


    Drainage Area vs Channel Width


    Slope

    Mean grain size/Basin area


    ad
  • Login