CALIFORNIA EXERCISE with out Penalty Lt – Last Class Lecture
Total Page:16
File Type:pdf, Size:1020Kb
5/9/2013 DATES TO REMEMBER • COURSE EVALATION PERIOD NOW OPEN Go to www.hunter.cuny.edu/te Regional Landscapes of the • MAY 7-14: Period to hand in OPTIONAL EXTRA CREDIT PROJECT listed on syllabus. United States and Canada Short research paper on a pre-approved topic. • May 16: Last day to hand in REQUIRED LANDSCAPE CALIFORNIA EXERCISE with out penalty lt – Last class lecture. Prof. Anthony Grande – Last day of Spring 2013 course evaluation period ©AFG 2013 • May 21: Exam III: The Final Exam – From 5:20 PM to 7:20 PM. Same format and length as exams I and II. – Last day to hand in extra credit exercise for Ex. III and “Geography in the News” extra credit option. CALIFORNIA OVERVIEW: Physical Geography Diverse region • Elongated state. both physically • North-south alignment of physical features. and culturally. • Subtropical “C” climates dominant. Yet has a national • Ample natural resources. and world image • Unbalanced water resources: water as a single-place deficiency in area of greatest need. region. • Prone to earthquakes. Overlaps Southwest Border • Southern area is subject to fires, mudslides and North Pacific Coast and temperature inversions. regions. 3 4 OVERVIEW: Human Geography Political Geography Question • Home to c.38 million people = 12% of US pop. Should California be separated into 3 states? • Ethnically and culturally diverse. Northern California • Economic powerhouse (2011: world’s 8th largest Central California economy, ranking between Great Britain and Brazil) Southern California • Strategic location on Pacific Rim (for trade with Asia). • Each area is unique both physically + culturally. • Competing land uses. • Each has its own priorities and outlooks. •Most agriculturally-productive area of the U.S. • Each complains of having to “support” the others. in both variety and value. • Has the highest urbanization rate in U.S. Similar arguments to the Quebec Secession or • An area shaped by the automobile. Upstate NY vs. Downstate NY or NYC vs. NYS 5 6 1 5/9/2013 PHYSIOGRAPHY Geologic Formations Cascade Mts. A. Klamath Mts.: fault block Klamath Mts. B. Coast Ranges: folded ridge A C Central Valley Lake Tahoe and valley structures B C. Cascade Mts.: volcanic San Francisco Sierra Nevada D. Sierra Nevada: fault block D G F Bay Owens Valley E. Basin and Range Area: fault block Coast Ranges Death Valley F. Central Valley: alluvial lowland B (former inland sea filled with sediment) E Salton Sea G. San Francisco Bay: an estuary of the Los Angeles Basin Depression Pacific Ocean (a separate geologic feature from the Central Valley) Channel Islands Colorado R Valley 7 8 Diagram of Block Mountains Physical Geography: Topography applied to California and Nevada A. Klamath Mountains . Area of rugged fault block metamorphic mountains in NW California. Rises to 4,000 ft. Central Sierra Owens Valley; Death Basins and ranges Valley Nevada Valley; Salton Basin C A L I F O R N I A NEVADA 9 10 Physical Geography: Topography The Golden Gate B. Coast Ranges . Linear mountain ranges (3,000- COAST RANGE 5,000 ft high) paralleling the coast. The only gap is the Golden Gate and SF Bay. Heavily folded and faulted as a result of pressure from Big Sur PACIFIC OCEAN SAN FRANCISCO BAY tectonic plate contact (North American Plate against Pacific Plate). Confines the marine influence to coastal areas by preventing San Francisco Peninsula air mass movement inland. 11 12 2 5/9/2013 Mt. Shasta 14,162 ft high) Redwoods National Park Topography Coastal Giant Redwood trees are found on the C. Cascades windward (wet) side the . Southern portion is in Coast Range. northern California. Volcanic mountains created by the subduction of the Juan de Fuca Plate under the North America Plate. Lassen Peak and Mt. Shasta are dormant volcanoes. Lassen last erupted in 1915. Lassen Peak, 10,462 ft. 13 in Lassen Volcanic NP 14 Mt. Whitney Donner Pass is the chief Topography route across the Sierra Nevada connecting the Donner Pass D. Sierra Nevada Humboldt Valley in Nevada . Between the Central Valley and with California’s Central the Basin and Range Valley. Fault-block mountains rising to 14,505 ft at Mt. Whitney, the Switch back road up east face highest point in lower 48 states. MjMajor barr ier to movement o f people and air masses. Few mountain passes cross it. East face of the Sierra Nevada Infamous for the 1846 tragedy when the Donner Party Wagon Train, following the Owens Valley (in the rain shadow) California Trail across the Sierra Nevada, got caught in a blizzard and people resort- Basin and Range Province ed to cannibalism in order to survive. 15 16 South Lake Sierra E. Basin and Range Area Topography . Area of Southern California east Nevada the Coast Range and south of the Sierra Nevada. Yosemite and National . Alternating ridges basins. Park . Site of Owens Valley, Death Valley and the Salton Depression. Topography creates a desert environment (rain shadow). Joshua Tree National Park preserves a 17 portion of the area. 18 Giant Sequoia Tree 3 5/9/2013 Topography Central Valley: San Joaquin Valley Area F. Central Valley . 400 mi long and 90 mi wide . Former inland sea filled with sediment from rivers eroding the Sierra Neva da. Divided into 2 segments: Sacramento Valley (north) and San Joaquin Valley (south). Productive agricultural area • Extremely flat, fertile • Favorable climate (hot, sunny and dry; irrigation needed) 19 20 Climates of Topography S F California G. San Francisco Bay Arid (BW and BS): desert and . Tidal estuary of the Pacific semi-arid Ocean reached via a gap - Highland (H): mountains – Golden Gate - in the Coast vertical zonation Range. Mediterranean (Csa): hot dry 2 1 . Divided into four bays. summers and cool wet winters. Marine West Coast (Csb): . Fed by Sacramento and 3 San Joaquin rivers. Golden Gate cool summers; wetter than Csa. Found along the coast. Six major fault zones pass through it, giving it its NW-SE 4 Conditions change rapidly alignment, and subjecting it to as you move away from the earthquakes. coast or up the side of a 21 mountain. 22 Climate Controls Precipitation . Chief source of weather systems and Varies with elevation moisture is the Pacific Ocean (westerly and distance from winds). the coast. A high-pressure cell moves north and south • Coast Ranges and most along the coast with the seasons, blocking Sierra Nevada form SF’s fog and westward moving weather systems. rain shadow areas. San Diego’s off- –Moves north in summer; south in winter. • Cold ocean currents shore fog –Its winter position allows Pacific moisture to reach create clouds, fog banks are the land. (Area is summer dry, winter wet.) and rain offshore caused by and along the coast. warm air . Temperature and position of cold offshore passing over ocean current affects precipitation least cold water. patterns. 23 24 4 5/9/2013 San Francisco Fog Los Angeles Smog Smog (smoke + fog) is a type of air pollution created when by- products of combustion mix with atmospheric moisture. (Origgyinally caused by the mixing of soot with fog in coal burning areas.) Los Angeles smog is caused when vehicle emissions re- act with sunlight to form In the Los Angeles Basin the photochemical pollution. problem is heightened by a com- bination of local weather and Fog is a cloud at ground level. This mix of gases includes topography that act to prevent When warm humid air passes over a cold body of water particulates and ozone. dispersion of contaminants. condensation occurs were they meet --- forming a cloud. 25 26 Inversion Layer Santa Ana Winds Warm Mojave Desert Air 2 LA Basin Coast 3 Ranges 1 Cool Pacific Ocean wind 1. Weak ocean winds push polluted air against the mountain. 2. However, the winds cannot break through stronger desert air layer. 3. They are forced to double back over the LA Basin, warming as they descend, and trapping pollution. 27 28 Santa Ana Earthquakes Winds and Fire California exists on Low humidity, hot temperature plus wind creates a severe fire hazard. the eastern margin of the Pacific “Ring of Fire”, a geologic zone of earthquakes and volcanic activity. Dots show epicenters Smoke plume of major quakes. 3 hrs later 29 30 5 5/9/2013 The San Andreas Fault Earthquakes Major zones (common throughout Calif.) – A. Southern California (LA southeast to the Imperial Valley) – B. San Francisco Bay Area Devastating earthquakes – 64 major earthquakes since the first documented one in 1769 that killed people in a mission church. B – Thousands of little ones. – Awaiting the “Big One.” Earthquake Laws: world-leading – Where to build, type of construct- A Sections of the fault are “locked” ion, usage. Laws have changed over (have not moved in hundreds of years) and time with new technologies. are closely monitored by geologists. 31 32 San Francisco San Francisco Earthquake of 1906 Earthquake of 1989 33 34 What’s different from the 1906 photos? Mudflows and Landslides Mudflows Mudflows occur towards the end of the winter rainy season As saturated soil (up to 30% water by volume) loses inertia and usually in areas that on a slope, it can no longer experienced brush fires at the support weight and moves end of the previous dry (flows) downhill. summer season. The steeper the slope, the faster it moves and the stronger it is. Landslides usually occur during and after an earthquake. 35 36 6 5/9/2013 Coastal Erosion Settlement History . Native Americans • Estimated 10% of all Native Americans before the European contact lived in California. • They lived by hunting, fishing and gathering. • Many small isolated tribes; many cultures exist. Why? Occurs during winter . Spanish exploration began in the mid-1500s. storms as waves batter • California was originally thought to be an island.